2007 A8L. A month ago I pulled front wheels to fix clogged roof drains. Wheel lugs were very hard to remove and put back in even when they were not yet seated. I used the oem lug wrench. A few days ago I hear and feel a clunk on one side that increases as speed increases. I start wondering if I may have not put wheel on correctly as it was so hard to turn lugs I may not have seated fully, or seated it oddly. So I pull that wheel, reinstall and do my best to really seat the lugs - they were really hard to turn and squeaking and had to use my foot to get them to where I thought they should be. Quick test drive and sure enough the clunk was gone. My questions:

1. Could I have damaged the wheel, the lugs, or where the lugs threads into? Or something else like wheel bearing? When I first heard the clunk I drove about 60 miles before I "fixed" it. I'm thinking I should pull the wheel again and check the mating surface of the wheel I have zero confidence that they are torqued correctly. What should I look for on the wheel?

2. I'm thinking I also have to fix whatever is making those lugs so ha d to turn.. If I buy new lugs and that does not make it a smoother/easier turn, can I run a thread chaser through the part that receives the lug? Or will that screw with the integrity of those threads?