In Mast Furling Issue

I have a Hunter 33 and have issues with the in mast furling. Perhaps the main halyard is jamming, because I can't completely raise the sail and am left with about 8 inches of loose sail. This is a problem when I try to haul the sail back in, as it folds on itself and is very difficult to hail in. I've tried loosening and tightening the main halyard multiple times, but can't seem to get the last foot or so. Worried that if I crank too hard I'll snap the line.