Hard to follow that post
but here goes...
prop pretty well always stops in the vertical and requires turning horizontal
You might consider getting the prop remounted on the flange.
With a four cylinder engine for instance, the crank is likely to stop in one of four positions. So the prop will tend to stop in one of two positions - in your case, this sounds like vertcal or horizontal. But if the flange has 8 bolt holes, you can remove the prop and relocate it one hole over and it'll usually stop on the disgonal.