[Closed] Help needed please with rear hope x2 calliper on my Onone Inbread SS

I've just completed my SS onone inbread frame build . Alls good apart from I'm having a mare trying to get the rear disc not to rub the pads in the hope x2 calliper.ive fitted loads of hope brakes on previous bikes but this is being really testing. Main problem being there's only a nats whisker gap between the disc and pad .also I've noticed that if I get the disc and pads lined so there nearly sorted when you apply the brake the disc flexes and I can't seem to overcome that .the disc does look ever so slightly at an angle in the calliper so that its closer to the pads at the top on one side and then closer at the bottom at the opposite side .as its a ss frame with sliding brake dropout slots I was told they don't need facing ?anyone help please