These will toast them selfs without that gaskets. 2 strokes die from air leaks. You'll actually want to do a leak down test after a rebuild with these. air leak = lean condition = melted piston.
As for the other questions, the port timing on these are very conservative. You've also got a massive amount of squish. Either make your own gasket or order 1. As for jetting, You can do a plug chop to confirm your jetting is spot on. If you switch to premix from the oil injections, you'll need to increase your jet 1-2 sizes. The oil injection on these are pretty solid if maintained. As for reeds, you can see if boyesen makes power reeds for these. I forced a set of blaster reeds into mine. Made a spacer at home, and ported the F out the intake to fit them. Nothing looked right, but was. Ran it hard for years.
Vibration on these are expected. The motors were designed for a 125cc set up, then had a 66mm piston slapped into it.
2 stroke jetting has 3 main circuits. Tune the pilot circuit then the main jet, then the needle clip
Idle Circuit: Idle to 1/4 throttle -> this is the pilot jet and your air screw
Mid range: 1/4 to 1/2 throttle -> the needle clip position and the taper of the needle.
Top end:1/2 to full throttle -> Main jet
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