I too had the same situation back in '06. I had an '05 7.2m2 Infinity. I thought the low end was not very good. The upper end was great. That is just my opinion.
I wanted more low end. I bought a '06 7.5m2 Severne Gator as I wanted zero cams, grid construction, and I had seen pictures of it rigged on a PWX RDM that looked O.K.
It does not really work right on My Ezzy 460, so I ended up buying a PWX 460cm SDM. Much better.
It think the bottom end is much better and the upper end is good, but not as good as the Infinity. I was happy to lose the cams.