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First of all congrats on the progress.
The problem I have with the "yank" idea is that you are robbing yourself of the chance to work some of the supportive muscles. The reason you go slow is so all of your muscles get a chance to strain. For example, when doing curls if you were to do a more explosive technique your biceps would get worked well. But you would miss the benefits that curls can also have on shoulders and forearms.
Part of the reason to lift is to gain usable strength. In day to day life you don't really use only explosive strength, by the same token, training your muscles to go really slow won't help much either. Go at a comfortable pace, not too fast and not too slow, go at about the same pace you would lift things in day to day life.
I'm not big on the supplement thing. As someone said in this forum before, it's great for expensive piss but not much else. A balanced diet will provide all the vitamins and minerals needed to see good progress in most fitness goals.
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