I’m having the exact same problems, I’m 4 weeks post op and trying to find a comfy bra is proving to be impossible!!! I bought a super comfy bra from m and s a couple of weeks ago but must have still had swelling as it seems to chaf my whole boob now, sports bras are impossible as like you say the lines go across the nipple or the band digs in and rubs on the scar, out of desperation I bought a Calvin Klein sports top but worried as i don’t feel it’s not got much support, if you find anything that works please let me know, I feel as though I am wasting so much time and money just to get comfort but to no avail, it’s driving me mad, I feel your pain xx