C
I think it depends on how you have some of the other parts of the suspension set up. For example, if you are running a relatively stiff amount of rear track shock compression/ rear spring preload/ ski shock spring preload, you probably have pretty good on-trail steering manners with the limiter out. I find that the sled has very little ski pressure with the limiter out + my other shock settings, and so it is sometimes nice to pull the limiter down for trail stretches so the sled doesn't just push through every corner. Most of the time I just leave it though because I'm lazy.For my riding the limiter strap is as long as possible and the limiter adjustment in the "LONG" position, rarely ever use the "SHORT" setting. One of my riding buddies fiddles with the limiter every time he goes from the trail to off-trail, guess he notices a difference, but really a wasted feature in my opinion.
Only other time I like it is when I am pulling a steep techy climb and don't want things to get squirrely. Track length probably matters too- if I had a 163 instead of a 154 I would probably leave it long and never touch it.