I will say this, beginning on a banshee as your primary bike takes patience to learn all the ins and outs, 3 years ago i knew basically nothing. Learning to tune is a very important thing. I run the same jets year round because, its not a drag bike where im racing for money or competition, so I dont need max power year round. I run on the rich side basically ALL summer. So if im going to the dunes, the extra load or hills wont matter because im jetted safe to begin with, then come fall my jetting is perfect. Then once it drops under 45 im done riding because its cold af. Also if your dialed in on your needle and pilot, The main jet and air fuel screw is the only thing you have to adjust. (takes 5 mins) Just trying to make a case for the banshee, because it sounds like from the sounds of it all the stuff youve been buying, needs help. unless your going buy a almost new 700. go for it.
squish is the clearance between the piston and dome.
yes you can adjust the needle position on the slide with the shim. clips in and out. the top is lean the bottom is rich. needle marking on the needle by the top.