MI sights have to be modified to go lower. I had a set that had the problem of shooting high....though it was YEARS ago but I don't think it was 8" off. I had to put the front sight in the mill at work and bring down the shelf the front post bottoms on. You can do the same thing in a drill press...but you'll need an end mill of the right diameter to get a flat cut. Personally, I'd just try a different front sight.