bw123

New to trials and setting up a low-hours used 2022 gas gas txt 300. It has factory jetting, JJH clip 4, 125 main, 48 idle, float parallel with base. Carb cleaned and checked out. Sometimes hard to start and can foul the plug if choke used too many times/kicks. Also, sometimes it will try to start cold without the choke. This makes me think it is too rich on the idle jet. I tried adjusting the air screw to maximize idle speed after setting the idle a bit high. This was not very conclusive honestly, but it seemed like the air screw wanted to be at least 2 turns out, so also pointing to a smaller idle jet. What are people usually running on these engines? Are they usually run a bit rich to maintain low end power? Additionally, I ordered and am going to install S3 lower compression head to help with starting and tame the power for learning a bit. Will this affect jetting? Any other recommendations appreciated!

New to trials and setting up a used 2022 gas gas txt 300. Any recommendations on where to set the shifter height? Right now it is set well above the peg height.