A little advice in case you're 6/7 people in this world who enjoy masturbating: Don't even think about. You will feel things happening in your brain that you'd never felt before, and even as disgusting the experience will make you feel during and afterward (shame is a product of time, how much of it you do on these things) the sensation of all that synergy boiling out your brain will make you want to do it again next time you hit the weed n' speed combo. Once you start you have a hard time giving it up.
But I'm speaking mostly from a meth standpoint. A highest enough dose of Adderall and you should be in the same territory (60-80mg). Anyway I think weed goes great with a speed comedown, just give yourself something to do, like read or do homework all high. Being high while on adderall's peak can just intensify how retarded one can be from pot, and it's never been my wisest moments.