If you are sure the end of the screw inside is pushing on the end of the square shaft and you have it wound up with that much force. I would next give the center of the puller a sharp rap with a hammer. Lots of times I have seen that work sending a shock wave down tool will break the friction and the puller force will move the fit. My next step would be to put some heat on the crank with a heat gun not a torch. The aluminum will heat quickly and should expand the fit while the puller exerts the force to get it to move. You don’t know but the past assembly could have been done with Loctite or something and the heat will help with that.