Hi Chip,
No … but it would depend on the firmness of the Dunlop compared to the Talalay. If anything Dunlop in the same ILD will be a little firmer than Talalay for most people because it gets firmer faster than Talalay once you are past 25% compression (which is the depth of compression that is used to measure ILD). Dunlop will start off a little softer with initial compression and then “catch up” at 25% and become firmer. Dunlop also has a wider ILD variance across the surface of the mattress than Talalay and ILD measurments are not as accurate with Dunlop as they are with Talalay.
The “typical” solution would be to add a topper as a comfort layer. Going to a softer 6" layer may also work if there is enough initial softness to relieve pressure before the layer becomes firmer as you sink further into it. You could certainly add a memory foam topper to the latex core just like you could add a softer latex layer and the4 choice between them would be based on your preference between latex and memory foam. Both can do a great job with pressure relief but memory foam is not suitable for a support layer and always needs a firmer layer underneath it.
There are too many variables and unknowns and individual perceptions and preferences for me to know how someone will feel on any mattress or material that is more accurate than their own personal experience. I just don’t know. My guess though given your comments is that you may need to go down more than one “level”. A single layer of latex can work well as a mattress because even softer latex gets firmer as you sink into it and can provide good support but you will generally need a few inches of “softness” even in a single layer. A a thinner 6" layer will also get firmer faster than a thicker mattress.
The only real way to know would be through trying a 6" mattress where you knew the details of the type and ILD of the latex you were testing so you would have a reference point. The odds of success would probably be better adding a separate comfort layer though because then you would have good pressure relief from the topper and good support from the firmer latex below it.
If there is a Pure Latex Bliss dealer near you (you can see a search on the PLB site here) then it may be worthwhile testing the pamper which has a 6" layer of firm Talalay (40 ILD) and a 2’ 21 ILD layer over this to see how it feels for you and to be able to use it as a reference.
All of the other PLB mattresses have a 6" 36 ILD support core with thicker comfort layers of various ILD’s on top of this which may also be useful as a guideline (you can see the PLB specs here).
Phoenix