Regarding cant, while some cant helps conceal the end of the grip, too much causes the back end of the slide to print with guns having a long back end like Glocks. I have not yet carried a gun with an optic, but could imagine too much cant increasing optic printing. Also, too much cant requires a less comfortable wrist position when grabbing the gun.
My carry position is about 3:30, making 15 degrees the absolute maximum that will work well. Zero cant can work well in that position for a subcompact semiauto. I really appreciate a 10 degree cant option, which for me is perfect. Ten degrees works well with everything from a P365 to a Glock 19 for me. I have not carried a full size 1911 in years (it was never an everyday choice), but 15 has worked well for that gun.
Sent from my iPhone using Tapatalk