Woahhhh, pump the fucking brakes or you're going to lose whatever traction you have left. Adderall?! I always sort of thought of it as being self-regulating because the dirty levo isomer produces some of the nastiest side effects that most people find unbearable, and therefore would naturally stop redosing when it only induces more discomfort and anxiety, insomnia, anorexia, etc.
You definitely don't need to taper with Adderall.... That's one of the few benefits of amphetamines, in terms of withdrawals, there basically are none, and it's usually a mix of psychological/physiological symptoms ranging from absolutely no withdrawal symptoms at all, to mild to moderate lethargy, general loss of motivation, feeling like you have no energy, maybe some cravings here or there but my experiences with Adderall were negative, 90% of the time. Although I didn't ever abuse it to the extent of amphetamine psychosis, I think that out of all the forms of speed available in North America, Adderall (Pharmaceutical grade Amphetamine, with the isomers at a 3:1 ratio of dextro : levoamphetamine) is the most likely to cause, or, quickest to induce amphetamine psychosis compared to other common forms of speed such as pure dextroamphetamine, dextromethamphetamine, etc due to the dirty levo isomer causing so much unwanted stimulation on your PNS (Peripheral Nervous System) causing side effects and not desired effects.