I think you're fine...to be honest, your MCAT score indicates that you know it well enough to get a good score in the biological sciences section. It has been less and less emphasized on the test over the years anyway, which makes me believe medical schools care less about organic chemistry in demonstrating academic ability. I'm in a similar position (although just 2 B's in orgo compared to As in other subjects). I think you have a shot anywhere and it shouldn't be too much of a red flag.