When i bought my new Dawes xc 1.6 i never bothered giving it a ride before i bought it and it turns out that the front brake disc catches on the caliper. don’t worry about trying to alter the caliper itself although there is movement to do this i found this took longer than my current method.
Basically if you turn the bike upside down and spin the wheel to which ever disc is causing issues. and you see which way the warp / bend goes, all you need to do is stop the wheel and push your disc the opposite way and then ride the bike to check if it still rubs.
I’ve found out that the discs are pretty soft and will bend easily back to another position so a slight push with your hand is usually enough to stop and excess rubbing noise or vibration.