It seems like you have never done anything like this before.
Removing that primary can be difficult even when using the right puller.
The first thing you have to do is to find a way to prevent the clutch from rotating. I tend to use a steel pipe and some steel wire... .
Now install the puller and torque it as hell, the clutch might pop off if you`re lucky. If not, the clutch puller will get bent and you risk damaging the threads in the crank. (I`ve done it, easy to fix with a "thread-tap" but if you don`t have the tap then you have to get one.. hehe).
Now when I remove clutches I use my own puller. Use a combination of a puller and a primary bolt.
As you can see I cut a flat head screw driver "track" in the en of the bolt, then I thread it into the crankshaft, then I put the puller in the primary, this makes a much more stabile and stronger puller. (I slide the copper collar longer out before I install it in the crank, to give the puller better "steering" ).
A pic from the removal of a V-Max 4 clutch. I guess you have the engine in the sled, but you can use the same method only in smaller scale.
Here`s how a standard puller looks.
A bent standard puller.. hehe.
Good luck man !!!!