Hi DuckytheLoon.
Thank you for your appreciation 
I am glad that the return process with Purple was straight forward and that you have that inflatable to “fall back on” while you decide on your best match mattress.
All the options you are looking at are good quality/value so I look forward to learning if the Arizona Premium Mattress also makes it into your list of finalists.
Both recommendations you received are based on the different mattress constructions, and I agree that both seem sound and good. SleepEZ is correct that you don’t need more layers and thickness as you can get excellent balance support/comfort with the layering they suggested and options you would have available if some finetuning is needed…
The latex firmness is sufficiently described by either ILD ranges e.g. Dunlop (26-32 ILD), Or ILD midpoint of range e.g. Dunlop (28 ILD), or name denominations e.g. medium Dunlop. Either of these specs in the case of latex are sufficient to give a very clear idea of the support/comfort levels. LMF and SleepEZ are sister companies and very likely that the materials used in the componentry are similar.
A missing encasement or batting between you and the Talalay will certainly affect your sleeping experience. As far as the overall experience with both mattresses goes, there are many interconnected variables that come into play. The added thickness with an extra layer of Talalay, in the case of SO, the source of latex (even different batches of latex from the same manufacture can slightly vary from each other), the cover and quilting are also coming into play when comparing two mattresses from different manufactures. All in all, I’d say that the Sleeping Organic will be softer than the other options offered by Sleep EZ … in the end, it all comes down to your comfort/support needs and personal preferences as only you can feel what you feel on a mattress. Again, softness and firmness and the “feel” of a mattress is very subjective and varies with each person’s weight and body type, sleeping positions, preferences, and individual perceptions. I would suggest narrowing it down based on other features: is the ability to exchange half layers especially important? Are you more interested in an extra-soft comfort vs soft Talalay? Is the budget an issue? I’d have another look at your own personal value equation and what is most important to you.
Thanks for doing the math for the SleepEZ Labor Day/TMU and Sleeping Organic’s Labor Day Sale TMU discounts! I am sure other consumers will find it very helpful.
Looking forward to hearing about your final decision and of course any other questions you may have.!
Phoenix