My son is on a 67 D3 Evo. When we bought it two years ago he weighed about 180 pounds. He is now 210. He skis into 15 off at 36 mph. The ski is biting on his off side. I've talked with D3 and have made fin and boot adjustments but I can't seem to keep the ski from biting and breaking him at the waist. Is the ski to short based on his weight, is it a technique issue, characteristic of the ski, or a setting problem?