I've never understood why the first things that's always suggested in this situation is the ACR...it's almost never the problem, and is the LAST thing I would check. The engine turns over decently fast every now and then in the video, so it's not the ACR. The spring either fell off or it didn't, it's not going to work some of the time...
I finally had two minutes to watch your video. First, your battery seems weak. How old is it, what's the CCA rating, and have you had it load tested? Are your grounds clean and battery/ground cables in good condition?
The first thing I would do though is get the timing set correctly. If I understand your most recent post, the engine firing slows the cranking down, so disconnecting the plug wire lets it turn over at a constant speed. Sounds like the timing is too far advanced, causing the engine to fight the starter. Either use a timing light or the static timing method...gapping the points with a feeler gauge is not good enough. If that doesn't help, I'd check out the battery and your ground and battery cables.
Edit: You also need 10W-30 oil in the winter, or the engine will be very stiff, and a lot of wear will occur with every cold start.
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