Yeah, group was right so I bumped the front sight right. It really didn't take much, though I might give it one more little tap. One advantage of that skinny front sight post, I suppose, is the ability to do a little more Kentucky windage should conditions call for it.
There was definitely an ah-ha moment where suddenly I got comfortable, not too much sling pressure, adequate recoil management, etc. and things started coming together. It was late in the day, crappy lighting, tired from an 800 agg the day before so my next session should be more productive. Will try offhand too...
Oh, I've got a couple old British-style slings on the way, though next time I go out I might rig a spare 1907 leather sling to it.