As a frequent P-38 driver, I have found that the best way to get rocket hits is utilizing a gunsight that helps with the aiming
Search for "Mino's JABO gunsight" contained somewhere in the BBS archives. Help and Training maybe.
Along the horizontal center line are two notches below the center dot. The first (closest to the center notch) is the rocket notch, I call it, and the second (furthest) is the bomb notch. At about a 45 degree aoa or a little greater, put the appropriate "notch" on target and release the appropriate ordinance. Mino's sight has helped me a great deal in putting steel on target on JABO runs
Practice with it and your results will improve significantly
Gotta run, otherwise i'd post it here or find the link for it.
Good Luck and good jabo'n
Rob53