Choose a chara with a good ranged jumping D. Back out to the left corner and wait till he rushes in for an attack, then keep on jumping back into the corner and do jumping D's. You will hit him 3 times out of 5. If you want, you can combine that with the rolling+combo technique, do jumping-D's in the corner, roll through the next attack and do a small 2-in-1 combo from behind, then try to roll through him again into the left corner and repeat. Just don't try to super-jump over him (better don't jump at all).
IIRC, the projectile trick alone doesn't work well on diff settings higher than MVS, but using Takuma is always a good way to damage Mr. "I will do Genocide Cutters until you're tired" Rugal. Playing with Tak, I start with a few projectiles (mixed A's and C's) while making sure NOT to back out a screen length, then roll through the first few frames of his big round blast for a small combo or knock-down command attack. If I feel brave, I try a cheapo charge db,f+D -> qcb+P while he gets up or super-jump back into the left corner for some jumping-D's.
