1. yes, that is correct, you basically up the weights when you can easily do your max reps goal with your current weights
2. supps are really not needed, there is nothing like real food, however if you necessarily do want to use them, just grab a protein powder, some vits and omegas and that's it
As far as carbs go, there are a ton of ways to get quality carbs in, there's no need for carb supps, eat oats, rice, yams, red beans, corn, apples, etc...
3. you should check your knees and see if there's any problem there, i always squat "ass to grass" as you say and i don't have any problems, not a squat expert though, others might have a better input on this
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