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I'd be inclined to strip it back down to just the crank and start over again.
If you can't get the crank to rotate freely with .0015 on the mains your trouble most likely is there. Add the cam shaft into the mix next. If all is good there then do one rod at a time minus having a piston mounted to it... repeat until all 4 are good. Then add one piston at a time. You will find the problem.