When I cut the shifter out to accept the bushing I moved the pivot point up to get a little longer throw out of it. Then just welded them together. The bolt will go through the shifter bushing and sides of the shifter box.
It could be the cable I'm using is not stout enough but its what I had. I ordered a threaded heim connector which will I will add to one end to give me some adjustability, which I don't have now. If I still have issues after all this I will ditch the cable and rig up some steel rod.