I actually think 10mg of amp is just right. Gotta remember that he's combining three different stimulants which will all synergize together causing major stimulation. For instance, taking 50mg MDMA + 50mg MDA would provide a more powerful, stimulating experience than just 100mg of either MDMA or MDA alone. Also, I find 5-10mg of adderall is good to get me studying and feeling quite motivated, so 10mg amp mixed with MDMA & MDA sounds like more than enough IMO. If you think about the original analogy, his overall MDxx consumption is 115mg which is a reasonable dose of these alone. So apply the principles of synergistic increases and the MDxx consumption probably reflects the consumption of about 150mg MDMA or MDA alone. Add 10mg of amp in there and you've probably ramped it all up again. Always have to tread carefully when combining stims, unless you enjoy being a sweaty, tweaked out stimulated mess.
I agree with folley, I'd avoid re-dosing on the amphetamine. The times I've taken a fair amount of adderall/caffeine/noopept combos I've had the odd unpleasant crash (nothing too out of the ordinary, just unpleasant). Mixing MDMA with amp is certainly more likely to cause a shitty comedown. If you're gunna redose, I'd recommend a small amount of MDMA or MDA (30-40mg MAX), especially considering you say your sensitive to stimulants. Re-dosing and mixing different stims sounds like a recipe for a great experience, but also a shitty comedown. Depends on whether you think that trade off is worth it or not. At least if your redose was MDMA it would not have such a large synergistic effect considering that the majority of you're taking already is MDMA.