Pictures of mods to bolt and magazine. Bolt nose is rounded and tapered back. It's hard to see, but I've put a slight taper in the bolt for the first 1.5" or so. Also sanded/polished all edges to smooth bolt stroke and feeding.I would like to see the pics you have. Both of the foil on the mag and the bolt before and after sanding.
What is the thinking as to how the stock mag orients itself after 1-3 rounds?
I could definitely go further with this and I think it would improve it further, but you need to be sure it catches the next round solidly. Remove too much (like an 1/8") and you will have a single shot 22lr. So go slow.
Magazine: I added strips of electrical tape as initial build up material and then several layers of foil tape over top to get to final thickness. It should go in snugly/firmly and stay that way regardless of pressure front/back on bottom of mag.
Goal is to keep the mag at the same height (all way to the top) and have nearly zero pivot for and aft. If you wiggle magle front to back, you will see the front edge near chamber move up/down which is what you are trying to prevent.
Tape wears in after a few removals so once you get close add a layer or two as it confirms to your rifle.