I learnt something from the suspension dude at Pro-Action recently and thought I'd pass it on to others. He told me to make sure my forks were parallel when installing them. How could they not be I asked? He explained that when tightening the axle nut, because the fork leg binds to the axle it can pull the forks out of alignment. To prevent it happening, loosen the two pinch bolts on the right fork axle and tap a screwdriver into the pinch gap to open it up and release pressure from the axle. Then bounce the forks up and down a few times then tighten the pinch bolts up. Done - forks are parallel. I had never even considered this but it can and does make a difference.