Replying to FKS problem?!

So i have 2 pairs of fks 140's and I ride on an 8.5 on the heels and 9 on the toepieces. im 5'10' 135 and ride quite aggressively. I have had never had any other problems other than having my pants getting caught under my heels when i ski switch or session the park. I did not experience this problem last year when I was much lighter with an 8.5 Din when competing, so I am a little unsure if I need to increase my din or there is a problem with forward pressure or somehting. If it is just that the din too low, then I have no problem with handling them on a 9.5-10.