i feel like there is plenty of room for adjustment, even though you say you dont want to go that route, the two holes drilled in the bumper mount pictured, not sure what they are for, nothing he did really justifies those holes, also your bumper mount in the same picture is missing the lower bolt and frankly all but one of the bolts in that picture are the wrong bolts for your bumper, so something else is fishy on that install, the missing nuts and incorrect nuts throw up a red flag for me and would have me looking all over that bumper for things out of wack, the cover actually looks nice in the pix, just needs a good adjusting to be correct.
Edit: looking at those pictures it appears the truck has been wrecked, are you the orig owner? that would explain alot about the wrong/ missing bolts and poor fitment