Mark - I have had the same struggles. I found my eye dominance switched when I covered the trap targets with my gun, leading to some very frustrating results. Changing the POI so I could float the target over the barrels really helped. (Easier said than done if you are shooting a vintage sxs - I use an Italian OU with an adj comb for shooting clays, so that was an easier fix for me). Be careful when using those comb riser kits - the pads can change cast as well as drop.
The best trap tip I got was to make sure you eye stays focused on the top of the bird - with the going away, rising target, your focus can drop to be bottom edge causing you to shoot under the bird.
What I have struggled with for both skeet and trap is that to be competitive in either requires shooting techniques that are inconsistent (or worse) for wingshooting. That said, the trap and skeet shooters I have hunted with are good wingshots. What I have realized is that, while the pre-mounted shooting technique may be very different from wingshooting, the intense focus on the target required for successful skeet and trap (and SCs) shooting is also critical for successful wingshooting. So when I shoot trap now, I see it as good practice for hard focus on the target, and don't worry as much about low gun vs. pre-mounted.
Last edited by Doverham; 06/18/12 10:44 PM.