Finally got the head cut down on the ZXI and it's AWESOME!

I'm now getting aroung 165 - 175 psi from each cylinder.

I'm wondering this: with that kind of compression on my Sea-Doo, I was told to switch to BR9ES's. I'm wondering if I should switch to BR9ES's on this 750 ZXI, and if so, what gap should I use?

Finally, I just purchased an R&D intake manifold and Mikuni 44mm carbs w/ Flame Arrestors. I'm wondering what kind of performance gain I can expect from the new carbs & intake, and if there's anything I need to do ahead of time to set the carbs up properly.