Jeff,
I've shot hundreds of rounds of skeet with a Beretta Model 1000 O/U and I use 1 oz. of either #8½ or #9's which ever is available during the summer months. I will use #8 shot during the winter. When loading from the bench, the wadding is Alcan ½ over-powder card, ½ Alcan cushion wad, and over-shot card. Powder charge is 1 oz equivilant of Goex 3F. I do tailor my wadding at Station 1 (low house), Station 7 (both Hi and Low House) and Station 8. I dump the cushion wad.
At Station 8, I have even made spreader loads by loading ½ the shot, add and over-shot card, add the rest of the shot and top off with another over-shot card. It real "smokes the target"
When I load from the pouch, I use 3 over-shot cards instead of an actual thicker over-powder wad. Same cushion wad and over-shot combinations, (less to carry and less confusing to load).