If I can get some documents describing the optimal settings for these, i'll be sure to give them a shot. Apple's service source documents show how to perform the adjustments, and the figures they should read at, but unfortunately they require one of Apple's internal test tools.

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All you need is a multimeter and test pin 6 on the power supply to adjust to +5V. See Tom Lee's documentation for proper adjustment voltages/proceedures.

Not sure why you reflowed all 2,000+ joints. That is rarely a cause of the sad Mac since they are unlikely to crack under use the way many may on the analogue board. The most common failure on the logic board is bad RAM chips, mismatched/align ROMs, and low voltage.