Thanks for starting a VERY interesting thread Storm!
I suspect there's as many different thoughts on how to improve accuracy as there are shooters, and that is as it should be.
Right or wrong I suspect my own experience is exactly as Hanshi pointed out....this may not hold true for everyone, but I know dozens of shooters who feel strongly the same way I do.
FWIW; My Load / Bench shooting zero / group is
never the same zero for my off-hand shooting.
I will fine-tune a load from the Bench, to be sure, but as soon as I off-hand that bench zero for group, using the same sight picture, my group will be low at or around 4 / 5 o'clock.... every time.
Consequently, on my rifles with fixed sights, I never drift the front sight until my bench load is as good as I can get it by "holding" appropriately...I'll then drift or file the front to confirm to my off-hand center group.
Another thing is sights, early on I tried a passel of sights....always had to have what ever was trending at the time. For a few years the front blade was brass, brass on black, then nickle, then "pure" German Silver, then Ivory tipped on black, then whatever else came into vogue next.
About 25 /30 years ago I started shootin cold-black and I haven't looked back since...for open sights it's black on black...as black as I can get but never shinny.
If I was to offer one tip, that I felt was iron glad and would help everyone improve their shooting scores, I would say keep your sight black and plain old soot works wonders for that purpose....maintaining a figure eight at KD ranges also seems to help a bit.
YMMV on every thing I just said, but if you haven't tried it, you may just be pleasantly surprised.
Uncle Russ...