RE: Pure acid 80
I have no experience on Ezzys, but I wonder if you've sailed their latest offerings. They have a VERY deep profile, like a camber sails from the 80:s. So, a 5.8 Ezzy will probably produce a lot more power than the 5.8 Session. At least thats my guess. A freind of mine rides 07 Ezzys and are now getting along with them quite well. He typically rigs smaller than me though, despite being heavier.
Maybe someone else has more relevant experience on this topic.