I sail a '06 Sonic 95. The board came with drake Pro 32 cms. fin. After sailing a few times, I decided I didn't like the fin because of its unsecure feel at speed (and I am rather a "glide" type sailor than a "power" one) so I bought a set of Deboichet SL2's. despite the Drake Pro is a Deboichet licensed design and almost a copy of the SL2, the feel is totally different as the SL2 feels much more secure.
I must say that this last Summer I had an occasion to sail briefly an iSonic 111 with a 6.5 Vapor and stock (36?) fin; the feel of that modified '07 fin was much better compared to that of my '06 model and much closer to that of original SL2s.