Clarifications about Frame Squaring Video?

I'm looking at squaring up a V-Core 3 400mm frame that is about .65mm out of square, and I'd like to double check a few things about 3d Printers & a Whiteboard's video about squaring (https://www.youtube.com/watch?v=h7ZTq2dDTkM)

It sounds like for just a tilted bed mesh, the A/B points (the X axis in the front) is generally always going to have the actual corners defining one plane (since this is where the two points of the bed triangle are?)

It sounds like corners D and C are hard to adjust, so generally you're just adjusting the Bar [AD] and Bar [BC], except we do it on the A/B ends of the bar due to D and C.

Questions:
1) Because A/B make up one edge of the triangle in the actual graph, it sounds like we're really only worried about adjusting D and C to match?
2) We adjust D and C corners in the mesh generally by moving the segments on the A/B corners?
3) Is there a way to make the printer do the bed mesh faster to test more?
4) How difficult should adjusting the corner be? I took a hammer (with a block of wood to soften it), undid the bolts indicated in the video (the 3 vertical, plus the top ones) and gave it some good strong whacks but it doesn't really seem to be moving, could it be that I over tightened the horizontal on the opposite end of the AD/BC segments and that's preventing it from twisting down a bit?
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YouTube3D Printers & a Whiteboard
This video is for those who struggle getting bed meshed with their RatRig V-Core 3.
Please feel free to jump to the chapter you are interested in.

0:00 Intro
1:05 about the v-core 3 frame and bed leveling
8:26 what to take care of in the building phase
9:17 the right square
10:09 build tips
16:50 adjusting the frame according to your bed mesh
...
RatRig V-Core 3: How to Get a Square Frame
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