I don't feel too bad about it. I like to learn about all kinds of shooting and expect to make a few mistakes along the way. I think I can redeem this project by finding a really sweet shooting light 12 gauge load for both trap and skeet. Of course, I hardly know why I'd want to do that because I already have a 20 gauge that shoots with minimal recoil.
I am beginning to conclude that since so many 16 yard trap shooters are fond of light loads of 7/8 or 1 ounce, they may as well just use a 20 gauge instead of a 12.
One firm lesson from this is that since I'm only interested in loading 25 to 50 rounds at a time, I am surely better served by the Sizemaster. I may change my mind, but as it is that MEC 9000 progressive is on my, shall we say, fewment list. Kind of like a 1960s English sports car. Fun when it works, but a real pain the rest of the time, which is almost always.