Beautiful gun by the way Bob. That is a real keeper. I think the tighter second barrel was more a carryover from field hunting times. If Skeet was designed to simulate real bird presentation then a tighter second choke seemed correct for the second bird. But in real life, the later you shoot the incoming second bird on 1,2,6&7 the closer it is, so tighter chokes are backwards to needs. But for real field shooting WS2 works well for many second shot needs.
Choke degrees are a favorite topic for some. One of my favorite doubles for jump shooting ducks was choked .010 and .020 with 6’s in lead shot. Dropped many a black duck and mallard slowly going up small guts in my marsh. A nice push pole with a duck bill end would quietly move a flat boat up the gut until you were coming around a bend with ducks sitting there as surprised as heck. Pity you can’t do that anymore. Lead shot was excellent for the job.
