OkieCruffler, You are doing so well with greatly reduced loads, I say get what you want. Should you go with the 12, though, and you know this I am sure, you have the option of shooting 3/4, 7/8 or 1 ounce loads, and if you want to crush someone load up some 1 1/8. The other thought, if I recall what Zippy13 has said in the past, is that the shot column of a true 20 is really different than a 7/8 ounce 12 gauge.
By wanting a higher comb for trap, do you mean that you want to raise the height of the comb in relation to the rib or do you mean that you want to raise the entire gun up in relation to your shoulder so that you can shoot with your head held up more? Perhaps you mean both.