not sure youd notice "more power" with a 350 and just those mods. but youll notice where inside the rpm ranges that power lies... should be a little lower range oomph, and raise the top end a little. we're talking 24 vs 20 hp here....
but, I bet it sounds WAY cooler.
if it doesnt bog or hesitate, and your plug looks ok... you should be fine. I don't think any more jetting is going to change much. I would expect 1-2 sizes over stock maybe...and maybe change the pilot up 1 size.... jetting doesn't really add power. unless you make MAJOR changes to the motor.
what is stock jet? and...are you running with no lid?
razr 2's have a lot of grip, maybe too much tire for a 350, might be stealing all your torque