Airflo- urethane, rather than PVC construction. I've had more problems with leaders, Any movement in the line is usually enough to set the hook with small midges. Unlike fishing dries in current, where some slack is great for a perfect drift, stillwater is better approached with a straight leader and tippet. Make sure you're getting good turnover, and the first thing I do when the fly lands is use a hand twist to get the slack out. In lots of stillwater situations, the problem is waiting for the fish to actually turn down and close its mouth. Very easy to pull it away at the first sign of surface disturbance near your fly. I'd suggest using flurocarbon tippet, if you're not already. If they are just bumping the fly, change to an emerger and keep it high up by greasing the tippet to within a foot of the fly. I've had lots of practice just south (and NW) of you, my friend, hope you are blessed with lots of success.

Charlie