It only takes a slight turn to break it loose. Once it breaks free you can spin the clutch right off with your fingers with very litte resistance. It just needs to be broken free. Try to figure a way to get a good sharp blow in the correct direction to the clutch tool . Even if it means letting the clutch tool jump out of place a few times and trying again. It just needs that sharp rap (or maybe several). It's not like a locknut, once it's loose you'll know it. The clutch should break free before anything else breaks if you have the clutch tool aligned right and you haul off and whack it a good one. Myself, I use a pneumatic impact wrench and it only takes a couple impacts from it to do the job.