Williams does nice trigger work, and offers a couple of options. My buddy had one of his HK91's done, and its more inline with what US shooters tend to like. Personally, I think ts to light for a gun that might be carried "loaded".
I had a couple of HK91's and an MP5, and found that once you get used to the HK triggers, its really not a big deal. Contrary to what some will tell you, you can shoot very well with them as they come, you just need to learn them. I also found I was a lot less of a "trigger baby" once I did get used to them, and I wasnt as sensitive to some other things, as I had been in the past. Its sort of like learning to shoot a handgun DAO. Once you learn those triggers, you can shoot pretty much anything, and arent "stuck" or limited to a specific type, like you are if you only shoot a SA gun.
Loading wise, I had a port buffer on both my 91's, so the "dent" thing wasnt an issue. The flutes really arent a worry either, and most come out of the tumbler barely noticeable. I did notice that I usually only got around 6 reloads out of the same brass I would get 10+ out of in my M1A's, or M1 (I only load commercial brass). Thats assuming the case mouths survived that long with any of them. I think the HK's action/extraction is just harder on the brass, and case head separation indicators always seemed to come in about half the time. I only load one load for .308, as I have a number of rifles chambered in it, and it just keeps things simple. Except for a few special purposes, I use mostly 150 grain bullets over 4895 or 4064, and it was never an issue in the 91's.