Alright so it was rainy tonight and went out to try some launches but I couldn't figure out one friggin way to "build" boost when im revving. It was still in vac the whole time, every time... how do you guys launch on boost I am deffinetly missing something here. BTW I would make a tree in my mind

holding it at 3.5k then right when im ready to launch I rev it to 5k.