I love my 144, maynot highmark the day after a big dump but gets around just fine. Tree riding its great, even out climb the 151 in our group(I won't have it set up the way he does). Trail riding is ballsout seems too do both well. Im 225 with gear so I wouldn't be scared of a 136 or 144/146 X 16 at you size. You do have to pay attention to where you going and not slow down too much when your in the steep and deep and have an exit route, where the longer tracks can more or less almost stop and keep going. I like the challenge of a shorter track.
