Hi NestHaven.
Welcome to our Mattress Forum! 
You’re very welcome … I’m happy that you’ve found us and that the information is assisting you with making an informed choice… but most importanly … Congratulations on your new mattress purchase from Nest! :cheer: .
Also, thank you for your patience while I took some time to confirm with Nest Bedding a few details that may be helpful to you.
I haven’t personally tried these two mattresses to be able to tell the difference in plushness but the general consensus is that Nests Hybrid latex is much plusher than the base version of AG (which you already know), and some say that it is still plusher than pillow top version of AG. (The difference in firmness rating on AGs own internal scale is from 7(firmer) to 6(softer) with the basic version recommended for stomach and back sleepers, and the pillowtop accommodating the side sleepers)
I would keep in mind that generraly it is not possible to tell the difference in comfort based on the specs alone as there are several other interelated variables or “specs” that will determine how soft or firm an individual layer or a mattress “as a whole” will feel and that ILD is only one of them. One factor may be the tufting in the AG which would compress the layers a bit more and compact the mattress as a whole which will result in removing the “false loft” in the layer and also reduce the degree of repeated compression it was subject to. Also Dunlop and Talalay aren’t directly comparable in terms of firmness using only ILD numbers because there are several factors that can affect how soft or firm a mattress (or an individual layer) feels besides just the ILD of the material (see post #4 here) because they have a different response curve and compression modulus (how quickly a material becomes firmer as you sink into it more deeply). In addition to this the ILD of different materials or different types and blends of latex also aren’t always directly comparable to each other (see post #6 here) so using the ILD of a particular layer or combination of layers as a reliable indication of how firm a mattress may feel to you compared to another mattress with a different combination of layers can sometimes be more misleading than helpful.
To make a very rough comparison … to get similar pressure relief from both Talalay and Dunlop, “the one-step” ILD difference would generally be in the range of about 4-5ILD with Dunlop ILDs lower than for Talalay, but again this.is greatly dependent on the type of latex (NR, SBR, Blended and % of blend) on the latex producers who generally use different methods to test firmness and may have different ILD ratings. If you are testing a mattress locally then none of this really matters because what you feel when you test a mattress will be more important than any ILD or comfort specs although I do understand that this is more important with an online purchase where you are looking to make an online choice that is somewhat comparable to what you have tested locally.
You are correct that a latex topper can be very effective in fine-tuning a mattress that provides good support but it is a bit too firm for your current comfort needs. It’s very good at providing the needed extra plushness, but it also is supportive as it has an unusual combination of surface softness and deeper firmness/support that comes from its elasticity,
If you did not yet purchase the topper you may wish to hold off for about two weeks as Nest will have a few more options available that you might want to try. I just confirmed with Nest that starting July 1st they’ll have available the major rework of their Nest Hybrid Latex and the Nest All Latex lineups which will now be carried in both Natural and Organic versions at very competitive prices (about $1,500 -$1,600 for the organic hybrid and around $1,000 for the NR hybrid. Both will still have the split layer with firm and medium latex options and the Organic zippered cover has all organic materials wool, cotton and latex and the hybrid versions. In terms of firmness, The Natural version has a soy base quilted foam cover and is a lot plusher than its predecessor, while the Organic will be slightly firmer than the NR version.
For the “princess and the pea” types that are sensitive to slight variances some of the other differences that may also contribute to how soft or firm it may feel to anyone in particular (down to the area of the body in which the firmness is perceived.) are the zoning in each of the pocket coil units. The three-zone design in the AGs spring unit allows for a firmer area in the middle third of the spring unit. The five-zone design in the Nest Bedding Hybrid Latex allows for a bit more contouring under the hips and shoulders. Some people notice zoning in an innerspring unit – others do not. Being deeper in the mattress, it tends to not influence comfort as much as it can contribute to differences in alignment if needed.
Having said all that … Nest Bedding is one of manufacturing Trusted Members of this site and like all the members here I think very highly of and consider them to compete well with “the best” in the industry. They’ll be able to give you good information about how the firmness of each of their layers roughly compares between their various lineups and Dunlop ILD’s.
I am looking forward to any further updates you may have.
@ Hammer.
Thank you for taking the time to share your experience. I appreciate it and I am sure that those considering Avocado mattress will find your comments helpful.
Phoenix