centering rear wheel between chain and seat stays on ss/fg
when i am mounting my rear wheel on my ss/fg the wheel will not center perfectly between the chain and seat stays. what i mean is that if it is centered between the seat stays it is out by 4 mm between the chain stays. and vice versa. this is a nice new steel frame, but i have had a pretty bad accident on it, so there might be a flaw from that as i had not noticed it before (and my nit-picking might be a result of not being able to ride for the mo). however, i had this issue on an old steel mass produced ss/fg frame and my shop returned it for me and got a replacement without this issue. my question is whether this is merely a cosmetic issue or if it is a serious defect that will compromise safety or frame integrity. any help appreciated.