SeaDoo does a really good job of getting maximum performance while retaining reliability, there's only a couple of performance enhancements that I would recommend. An aftermarket intake grate and an impeller, and on an XP possibly trim tabs. Even with these you're not going to see anything major, maybe 2-3 mph greater top end.
The 95XP had two engines the 720 and the 787, I'm not sure which one you have, if it's the 720 you might want to consider selling it and buying a 95 or 96XP with the 787 you would be gaining 25hp. I have a 96XP and I and a lot of other guys think this series, with the X4 hull are the best ski' s BRP ever made, you might want to check out the X4 hull thread.
Lou