I think the 325 temperature is the one you want. I believe that's where THC acid converts to delta 9 thc. then you can eat it and your liver in turn converts it to 11 hydroxy thc, supposidly this gets you even higher.
but the way I think it goes is, you can't go from THC A to 11 hydroxy THC, you need to go from THC A to D9THC to 11HYDROXY THC. that's just info for the chemists here.