Are the spots on the 2001 or 6061?
Again, there is the Ti racking issue, so take this only as a guide. We do most of our parts at what figures out to be 10 amps per square foot, not counting the Ti racks. In most cases, we find that 60-70 minutes works well. If the 6061 isn't dying dark enough even after 30 minutes, I would try an increase the time and see how that did. I would guess another 8-10 minutes should make quite a bit of difference.
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