Fudd, I'm impressed with your ability to sift through very diverse commentary without getting frustrated. "There are no absolutes" - oh, so true.

I shoot a M-21 26" Skeet model when the objective is a high score; I shoot the occasional 25 with it. And, I shot a respectable 42/50 at this years Fall Southern sportin' clays with it. However, my current fun gun (liking it better with every outting) is a 1946 Woodward boxlock pigeon (a W&S Proprietary finished by JW). It is choked Full left and mod right with 32" sleeved barrels. With 3/4 oz loads, I broke about 65/75 "skeets" this afternoon. One round was with spreaders and had no noticeable improvement in score.
Interestingly, I have been shooting about the same level at 16 yd trap. Historically, I have not shot trap well with a skeet model gun.

Above said, I'd be more worried about stock dimensions than choke. Some transition easily from skeet to trap with the same stock. Others not transition so easily. It would be good to know were you are with stock configuration.

BTW, I am a real fan of the 3/4 oz 12 ga loads and tighter chokes for fun/practice.

DDA