Living the dream
That will come with time. Keep working.I agree wholeheartedly with you. Auto is quite clearly more accurate, but that's predicated on not being a dufus with the lineup.
Try to eliminate variables. Start by getting your designation as early as possible, get it sweet prior to roll in, DON'T J-HOOK, keep AFC engaged the whole time, and then just roll in the same way every time.
Before long you'll be wondering what to do with all that tracking time. 8-10 seconds is a long time to sweeten lineup and tweak airspeed.
Then again, the majority of drops you do in the fleet/combat will probably be PGMs, so that kind of takes the fun out of all of that stuff above.