My 28 ga Repro shoots high

[edgarspencer]

LOP has very little to do with a high shooting gun. A shorter LOP may allow you to get the butt further up on your shoulder, but a with a longer LOP, the tendency is the opposite, increasing your POI. Drop is the biggest factor when you're shooting over the top. Unless your chokes are rifle tight, and you're not even chipping the tops of clays, your POI may be anywhere from 7.5" to a couple feet high at 30 yards with each 1/4" height in the comb. This may be overcome with youth, but with 60 years of instinct shooting, "floating" the target is not so easy.