Thanks for the photo Gateman. Not a smudge on em at all, I'm baffled. Curious if yours have these score marks?

Inner surface feels smooth enough. Might try polishing it anyway & see if that helps.
That's right Peahi, 2013 bar with a 2017 trimlite. Holes on Gateman's bars do look slightly wider but I got it assembled like that from kiteaddiction, surely they'd be aware if that was a problem.
Ruled out sunscreen Lexie & got the freckles to prove it, thanks though. Guess I'll put up with it until the grey tubes become available. Appreciate the input, cheers.