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Have you verified that this board supports a 3200+ processor? Checking the manual, it mentions "supports 1100 mhz up to 2800+". If not supported, that probably explains starting up at a default 1100 mhz.

It appears to me that you have interpreted the reference exactly backwards. Positive would be pin 1, on the left in your picture. The missing pin should be right next to positive. Try again to measure continuity from pin 4 (right-most in your picture) to one of the power supply connector ground...

Typically, yes.

Drive A: goes on the end of the cable, after the twist. B: goes before the twist. Both of the drives need to be jumpered as the second drive; it's the cable twist that switches the drive at the end of the cable to be the first drive. Looks like the jumper table for drive capacity is...

If the "shoe" thing you're describing looks like this: Then it's the spindle brake. It's designed to push a brake shoe against the spindle when power is removed from the drive. The shoe is supposed to have a .010" clearance when power is applied to the drive; if it's rubbing, that could be...

TI99/4A on Seattle CL: https://seattle.craigslist.org/kit/sys/d/poulsbo-ti99-4a-home-computer/6815354878.html

This is what I found for a WTX PSU pinout: Look about right?

Tektronics 4051 on Seattle area CL: https://seattle.craigslist.org/see/sys/d/graham-tektronics-4051/6809995813.html