Mike, if I shot that much skeet with that light a weight gun I'd have the worst flinch at the end of it I'd look like I was going through the DT's.
Well, not if you shot that light weight gun with a light weight charge. You shoot 7/8oz in your 7 pound 12 gauge clays guns. So shooting 3/4oz (6/8oz) in a six pound gun or 5/8oz in a five pound gun wouldn't punish you so bad as your big 12s I think. Your Damascus barreled LeFever 20ga was built to digest 3/4oz loads as its regular fare. Your cool little six pound Cashmore sidelock sixteen was intended to spew 7/8oz as its service load so dropping it down to 3/4oz (6/8oz) would put it in the same shot to gun weight ratio as your regular skeet guns. I have heard you complain about the high stock on the Cashmore: 14-1/4 x 1-1/2 x 2-1/4 as I remember it.
But I also seem to remember you shooting skeet with a Webley and Scott 700 at 6-4 and a Harkom at 6-6 or so, both guns 12 bore. So the light subgauge guns shooting light charges should punish you less than those two of course.
Shooting 5/8oz in my 5-3/4 pound Parker 28 feels about about like shooting a 22 rifle.
I learned to shoot double trigger guns at the tender age of 51. I learned to shoot SxS guns at 51 also. I learned by practicing with guns so configured. But if I hadn't gone to that effort I hope I wouldn't post a statement here like "Tough to shoot guns that come in with side by side barrels and two triggers..." But that is an absolute fact, unless you have practiced with such guns until you have learned how to shoot that configuration.