Hi Alex. The fitter is asking a good question. I don't know what the actual differences are in fine tuning the fit for each of those sports, but it's common for a Trap gun to shoot high. That's really just a sneaky trick to get more hits. The clay is going up, and so you need to lead it "up", but that usually means blocking the clay with the barrel. Hard to do. But if the gun shoots high, you can still see the clay and hit it too.
So, my guess, the fitter would make the gun shoot high if you want to focus on trap, and leave it centered for skeet and sporting clays.
But, shooting high or low is just one of 5 or 6 dimensions to be be adjusted. Didn't you mention in an earlier post that you were getting a bruised cheek? Make sure the fitter addresses this too! You shouldn't have to suffer, or make excuses about how it's really not your girlfriend slapping you! :wink:
Let us know what you learn, how well it works, what got changed, and all that!
-- Quackster