For round or tube polishing, I find it easier to run the wheel perpendicular to the length surface and moving down the length. Let the wheel and compound do the work--Don't apply a lot of pressure. Work a length then move (roll) the piece toward you so there's a little overlap when the wheel flexes slightly. Apply compound to the wheel frequently. (Every few square inches.) When the part heats up I usually wipe the compound on the part like a melting Crayon then buff that area.
As with any technique, patients and practice is the only way to get the finish you want.
Here's a steel generator housing. This isn't plated--It's raw steel polished in prep for plating.
This is how I generally get them.
