I'm trying to mount a Hope XC4 disk brake caliper to a pair of RockShox SID forks. However I'm having problems with alignment of the rotor in the caliper such that the rotor is rubbing on the pads. I read in the instructions that fitting is a trial an error job, whereby you have to fit spacers unitil you get it right. The problem I have is that I need to take material off the mounts in order to shift the caliper in the right direction. I've filed the mounts down a little which has made the situation better but more is required. However I'm not sure I should be filing my forks and don't want to stuff them up completely. Has anyone had experience of this? and whats the best way of solving the problem?