Preloading helps a lot and will also cut your 60' time down, but for right now don't worry about it. That's all fine tuning stuff. Go to the track on like a Saturday Test n Tune. We can get like 40 passes in on Saturdays if we really wanted to. Give you a lot of time to work on different things.
It also depends on if you just want to go all out every time and not give a f**k about being consistent, or if you want to win money in bracket class.
I feel it would benefit you to focus on things in this order: launch, then shifting, then prelaoding, then reaction, and the final touch is sandbagging