work on your body positioning to fix your nut to tank issue. aka use your legs more, squeeze the tank with your knees, keep the weight on the balls of your feet, not on your ass to the seat. i find when i get lazy at the track, i only have to rack em once, and its enough to remind me to not be lazy.
secret to a track bike is simple, suspension, brakes, tires n tune. basic set ups for all of these is more than adequate for most riders. q2's will run fast group times safely, so don't spend a buncha money on tires or warmers. suspension, sometimes just needs to be have the sag/rebound set properly to make a huge difference. brakes, sometimes are just fine, it's the fade that'll get ya in trouble. tune, absolutely critical to have a smooth throttle response.
liters have a steeper learning curve cuz of that throttle, with so much more tq under you, gotta be more careful :) good luck, glad you had fun