Yes we saw this last year not only with Pro's but with a mod sled we built. The mod had tipped up rails which we rode on for several rides with the same group of sleds...so you kinda knew where it stood with the other sleds as far as climbing. Once we straightened the rails out it made a huge climbing difference because it would just flat out "hook up" better than tipped rails. (Just look at a sled with tipped rails on a concrete floor and image what is doing in the snow...on a hill...with the throttle pinned. Snow conditions will play with this performance too...we tested in deep, dry rocky mountain powder).
We then put a power claw on it and with the function of that track made it even better for climbing in the pow...(nice design Bret R.!) now we are taking advantage of the whole skid length with this track and benefiting greatly from it. Of coarse this is a set up for playing in the back country with specific rider style, weight and skid performance ... not trails.