That would be me, who had the problem.
Trouble was, with the tighter tolerances of the round Sadlak guide, the op rod spring was catching on the machining marks and a burr that was left in the op rod from the factory. Imagine what a coat zipper sounds like everytime you worked the action.
First I cleaned the inside of the op rod with brake cleaner and a bore patch on a cleaning rod to remove all of the grease. Then I used some sheets of medium to fine sandpaper rolled up around a small dowel to lightly sand out the burr and polish the inside of the op rod. I finished with very fine emery cloth. A small bright flashlight is essential to make sure things look good inside as you go. Then I cleaned it again to remove any dust, sand paper residue, etc. before reassembling.
I like 7.62's idea of using a felt tip and red rouge to finish. I bet that really does the trick for a perfect finish.
Nonetheless, my action is smooth as silk now with the Sadlak guide, some Superlube grease, and polished op rod interior.
I can't imagine just leaving it and shooting it smooth can be good for the op rod spring? I would think you could only benefit from polishing the burrs out of the op rod.