@benjamin. I used MCAH. The recipes are essentially the same, except the AH version explicitly states that the jars should be placed on a trivet inside the PC. If one were to put the jars directly on the bottom, then, yes I guess, one could burn the oil and garlic. I don't think this is possible on a trivet under normal conditions. The AH version also mentions that the lids should be tightened, and then loosened by 1/4 turn to prevent the jar from exploding. I forgot if the MC says so.
Edit: I just checked 3-354, and it does not seem to mention the loosening step. Maybe that's it? But otherwise I see no significant differences. And I do bring mine up to pressure on high heat and then lower. Keep trying; it is really good.