Yes the coating on Aquarian American Vintage (or Modern Vintage which are same coating but NOT the larger diameter for oversized Gretsch shells) is very think. I like them when they break in, and recently accelerated the process with some success using very fine (600) sandpaper. Not hard work, and opens the Medium ones up nicely. I haven't tried the Thin ones so I can't say if they would be more to your liking.
It isn't just Aquarian who have heads which are labelled one thing but much thicker once the coating is taken into account. Remo are the same with Fiberskyn. The FD is more like Ambassador weight because of the coating, and FA is more like Emperor weight. That's why there used to be some other designation which was more like Diplomat weight in its feel but I can't see it on the Remo site now. That's progress I guess.
Ah. Now this is more like it. They are FT (for thin) in the old scheme and nicely presented on this web site so you see how they fit into the series
http://memphisdrumshop.com/index.php?main_page=index&cPath=299_300_314
I suspect the Fiberskyn product lines have been simplified since then, perhaps as part of the launch of several new types like Skyntone and Vintage A.