Ive been shooting trap for a while now i use a browning bps pump gun and i use a lead full choke, i find i powder more clays rather then just chunk'em. a steal modified is a lead imp cylinder this is a large patteren. the choke you have now wont have the range. i would go out and buy a lead full and lead modfied. start with a moddfied and then work up to the full. this should help your scores.