Stan, you can not over think the chokes. I shoot full chokes in my Winchester Model 42. I am happy with them so full, full and full works for me. Maybe yours should be mod, full and full to see if it makes a difference. I just hope they are nit to muzzle heavy. I’d need to lift weight to build up my arm so I could swing it well.
It is a very cool looking gun and one which I suspect would be fun as heck to show up with as a guest in the dove field. Nobodies going to honestly say their grandfather had one just like it.