IMO/From what I hear;read:

The S&W 617 are hit or miss with action/trigger jobs. I should say 100% ignition with a wide range of rimfire ammo. Cant really change out to reduced power springs without having issues with ignition. Same goes with going extreme with the hammer & bobbing it down. Most will polish/slick up the internals, "NOT File or change angles", & call it good.

This is my opinion on the top strap: If you cant live with the current cosmetic state. Then I would clean it up with some fine emery pad/paper and polish it up after.

Have a great one