The 2nd attempt I had 0 leg drive (first had little leg drive also, I remember feeling that was very heavy), feet were way under / back. If I drove with that stance I would have either slipped on the bench, or, raised my ass, so bad positioning. You mentioned bar path, and I felt it too, very high on my chest. For the 3rd attempt, instead of fixing my stance, I tried to fix the bar path, went way too low, and it didn't go anywhere.
I see what you mean about the board now, makes sense, I will probably do that when at home.
I shuffle my feet around right to un-rack, I sort of cork screw in to get a good grip with my feet, then when it feels right, I un-rack, which I think is good. I agree with my next attempts, my feet were set already (I tried to get more of an arch, bad idea).
I definitely think for me, leg drive > arch in terms of helping my bench. I can get drive on the high bench due to fee positioning, just naturally fills in, on low bench, it is uncomfortable. So, I'll kick my legs out more and see how that goes, and lower my arch.