"where do i measure to get a higher rear sight..."
Question brushbuster: How tall is your front sight?
My reason for asking is everyone here keeps talking about being "PC", but I've never seen anyone take exception to the front sights on modern recreations of the old guns.
The front sights on almost all modern recreations (my own included) are IMO
way too tall.
I have looked at many old muzzleloading rifles and one feature they all seem to share is a very LOW front sight.
Many of the guns front sight blade is no more than 3/32 above the barrel. Some are more like 1/16 tall.
Ya, I've heard all of the stuff about sight picture, and heat waves, and long shots cause the barrel to get in the way of the target, but when all is said and done, why, if all of these things are so important to us, were they not important to the old-timers who used those guns?
As you may, or may not know, I'm sighting in my latest gun.
It started with a .200 tall "turtle" front sight.
So far, I've removed .080 off of it. The more I remove, the better it looks to me. Of course there is a limit to how much can be removed, that limit being how much does it take to bring the shot to zero, but it sure is getting more realistic.
I guess rather than chew on your post, I ought to start my own on the subject, but getting back to your problem, have you considered really lowering your front sight?