hi
did you demo them with your current boots and suit yet?
the reason i ask is i had 3xl and felt they were too big but loved the torque generated when using them ... so i moved to 2xl and found very literally that they did NOT work the same way and actually achieved less thrust ... i sold them, went back to 3xl after trying jets, slipstreams, rockets, hollis, and mares... attached slightly tighter spring heels and have never looked back ... i may be incorrect but i believe the structure of the 2xl are different than the 3xl and this may be why there was a clear difference ....
if you are a newer diver with less experience with fin feedback when frogging, especially when reverse finning, you may not notice the difference, but your file clearly states you have over a thousand dives ...
hope this helps ...
also, i found nothing "wrong with" jets, slipstreams, or mares, just found the turtles much more applicable to my needs (northeast wreck diving)