Binding in the rotation, compression is fine. I fixed the issue by using the stock insulator/bearing and a thrust needle bearing under the nut. everything moves freely now. I had to drill the strut mount insulator to accommodate the larger threaded shaft of the coilover, feed it through the isolator, add the thrust needle bearing, then the nut with the long shaft through the needle bearing and isolator. The way I originally had it the coilover shaft was tightened to the isolator so when I turned the steering wheel the coilover body turned on the piston. Now the piston and strut body turn as one.