Patrick,
All suits are not created equal and do not compress at the same rate.. In the past suits used to be made out of real neoprene and not al these blends.. The suits were much more durable and warmer, current suits are much easier to get into..
My personal choice these days is to go to fully custom suits.. My choice is wetwear in florida (direct sales only) .. They can even make suits out of g231 nitrogen injected rubitex ( The bubbles are actually under pressure so they dont compress as much)..
In warm water I like 3mm suits, I do alot of deep diving but even when I am on the shallow side of my deep dives (maybe 200 to 250 fsw), most brands I have tried are now like skins, probably under 1mm, but the suit I use thes days is still probaly the equivalent of a 2mm suit . I can get away with a 3mm where others need a 5mm..
Fully custom suits are not cheap, but have lots of options available to them.. The last one I purchase was over $800 (most people spend in the $500 range)