generally, if you have a bullet fit issue, you'll see some leading in the first inch or two of the barrel. just looks like a rough area compared to the rest, or your grooves will be filled. you'll see where it starts and where the normal texture of your barrel begins. f you have a poor lubing issue, you'll see the same, but usually in the last couple inches of the barrel, where the lube starts to run out.
ill put a pic of some leading for you to see. i have a revolver with a very rough barrel and it always has some kind of leading in it.
as to running such a high load of bullseye, you won't likely have that problem if next time you find a faster powder that's more appropriate for the 9mm, like titegroup or HP38. but the thing about this that is still odd, is that you got the 90gr XTP to fly straight with about the same about of powder. so who really knows, but it works for now and i don't think you'll be buying those bullets again anyways, so use them up with what works and i won't lose any sleep over it.