I'll be "running" my first Ascent this year, and I've never done any legitimate trail running (other than down the Barr trail from the Incline on a short trip to Colorado Springs). I presently run in Asics Noosa Tri-6s, which are basically a stability shoe. I wore them when I ran down the Barr, and I felt like I needed more traction. I assume it's going to be similar going up? My goal time is 4:30, but I'm just on the fence as to whether it's worth up-ending my training with new shoes. Thoughts?