Once again, nice vid, and thanks for putting yourself out there, "warts & all", so to say.
I'll just give you my impressions, right or wrong isn't an issue, and no critique junk. You and I are at opposite ends in some ways. Your hands are much bigger than mine, like way bigger, so you have to find a home for all that meat as it wraps around a single stack. My natural grip on a 1911 is considerably lower than yours. Watching you got me to thinking, so I just picked up my Series 80 to check, & snapped a couple of pics. There is no way I can do my natural grip, and get my strong hand thumb up over the safety. Without shifting everything. I naturally grip way lower.
I went back to watch the vid you posted on the WWII Springfield, just to check. Because that's what I learned to shoot on, except for mine was a WWII Colt. You seemed to gravitate towards a naturally high grip on that one too, and shifted your grip a couple of times, trying to find a home for that big thumb on your strong hand, either over the safety, or under.
So, we both naturally differ on our grip height with 1911's. I also learned how to shoot offhand, with my left hand tucked behind me. I never used a supporting hand grip, or two hand grip, until a few years ago. Not unless I was shooting Magnums anyway, or double stack mag pistols. So to this day, my knee jerk reaction on drawing a pistol, is to one hand it.
I took a couple of snaps of my natural grip, it's lower than yours, and my thumb lines up with the trigger, & trigger finger, on the opposite side. When I look down my arm, the hammer lines up with the center of the inside of my elbow, and the frame of the pistol lines up with the main bone in my fore arm. My thumb knuckle & trigger finger knuckle are on the same level in relation to the pistol, and at a 90 degree angle to the pistol frame. That's what I see when I draw, aim & fire, with full extension. If I use a two hand grip, it comes in lower of course, and my thumb ends up touching the frame about where it meets the trigger guard. Sorry, I couldn't take a pic, no hand free to work the camera.
Glad you posted both the vids, they're fun to watch, and I do appreciate them. I think you might have just been a bit frazzled from the previous shooting, we all do better when we're fresh in the morning. Not bad shooting all in all, switching pistols in midstream can throw anybody off a tad.
Thanks for the vids, all good fun, keep 'em coming. & here's pics of my grip, with my small hands.