From the perspective of a very recent participant in the AFF program, and with only 38 jumps. Last October I completed a level "C" (first instructor release) and passed but it was sloppy.
I repeated it this spring and TOTALLY blew it. I was very unstable. I back slid, potato chiped, and an AFFI re-docked. Of course I had to repeat it. I wanted to think the jump was ok at the time, but I'm glad I had to repeat the level . . . I sucked, I felt lousy about wasting time and money, and really thought about cutting my losses. But 2 weeks later I did the same jump and was alot more comfortable. I passed and the jumps were alot more comfortable from then on.
Bottom line is . . . keep at it, and try not to let too much time pass between jumps.