It also says 14.5 ft-lbs, which is not all that tight, very frustrating ambiguity. I can't even go with the tried and true I've used on all vehicles, half turn past hand tight, because it's in such a terrible place. :|Yes! That happened to me too on my other bike. I finally got the k&n filter off by removing the exhaust to gain better access and using vice grips on what was left of the nut. On that bike next time I will slightly hammer the socket on before attempting to ratchet off the filter.
On the GSXS1000F I am just going to use Suzuki filters and the Suzuki "wrench". The gsxs shop manual says to tighten the oil filter by hand until the gasket just touches the block and the tighten two full turns. Man, that is tight.