I beleive you need to go by what all the top sporting clay shooters are shooting. More and more are changing to shooting tighter chokes. I regularly shoot clays with a guy who shoots Improved Modified in his Beretta auto. Even though the targets are close he still beats most of us.
A lot of English Bests were choked cylinder and full, I suppose for driven birds. I myself prefer to stick with more open chokes for target and 1 ounce #8's. When you get old you need all the advantages you can get.

Mike Proctor