The first issue with trenching , I believe, is the approach angle. Look at the Phazer track and then compare it to the Polaris that was in the group of sleds you were riding. You will find that the Phazer has a steeper approach angle. The sled is fighting to get on top of the snow. After that, the type of track is important. The Maverick track is for harder, packed snow, like in the spring. The polaris type 3 and type 4 tracks, along with the skidoo summit tracks are good choices. You just have to trim them down. I did a skidoo 16" wide track and cut about 1" off of each side with a skilsaw. The width ranges from 13 7/8" to 14 1/4" (I wandered a little bit) and it works pretty well.
I did a project of setting my rear skid back a few inches to soften the approach angle. You can see it earlier in this thread.
Just a couple of things to think about.
