I'm building a gun with a 7/8 across the flats at the breech, and 3/4 at the muzzle. Straight taper, .40 cal. It has very nice handling and pointing. I would not want to go lighter, personally. This gun feels really good, a comfy fit and weight. I think it will be a good shooter.
But when you talk to Roger Fisher, he likes a long heavy barrel for stability on the target. He wins a lot of matches. I don't.
At the end of the day, you'll have 50 opinions, and you must still make a choice. Good luck!
Tom