Just noticed a 129" x2" track on tracks Usa site, that seems like a good option between ST & LT for the 2T 300s or middle ground for flotation/handling. Maybe track companies will come out with some deeper lug tracks for the ST.
just sold one to a local fella doing it on his UFO kit,
its a nice felling track and suprisingly light for the lug pattern. i think it could bridge a nice gap, get a little more float without going all the way up to a 137. thats a BIG change in footprint.