You should always (if possible) be using the max. distance of the line for a pull, because the winch is the strongest at it's first wrap. So if you've got an extra 25' on there, then you've got to walk an extra 25' more to get to an anchor point, elsewise, you'll always be pulling with the lowest rating of the winch, which, if you'll look it up, is NOT a good idea... It's only 6940 lbs on the final wrap.

Granted, 6940 will allow you to pull a 4500 lb truck up a 49* free & clear incline, but, if the vehicle is stuck, which it would be, then that degree would be drastically reduced. So, if you've got a rock, or hole that's forcing the front wheels to have to climb up 49 degrees (much more realistic than being on a 49 degree incline!), then you're at the maximum rating of the winch. Anything more, and you've now overloaded the puppy. Not a good idea...

I would cut the extra 25' off, and keep it as a spotter rope. Attach a handle to it, so it's easily grippable, and attach a clip or similiar to the other end so you can quickly attach and detach it from the rig. Having it on the winch is quite literally asking for trouble, as it's NOT a useable length for winching purposes. You could easily overload the winch if you actually pull in that last 25' of rope under load.