I alway impose an alt limit on myself when I'm in the P47, I give myself 6k, I NEVER go below that, no matter how tempting the target.
That leaves me room to roll and BNZ, pull up and then immelman at speed 270-300 +
If I'm coalt with something like a lala then I reverse right away, I merge and go under them slightly off centre and then roll on them, sometimes with a notch of flaps to get my nose on for a shot, I usually wait till 1.5 then reverse, or I do the usual which is pull a tight turn at 800, watch them and roll in what way they are going and fire, 6k comes and I'm gone.