As the ports are now, I would be tempted to address the cuts with a finer stone. However, it doesn't actually matter. They currently have about a "160 grit" finish. Cleaning them up to a "300" would have next to no change, and polishing finer would be counter-productive -- see the section on laminar flow.

You can see 1) the "re-breather" coming into the exhaust port, 2) that I did not remove all carbon. The blast box is currently set for much finer work, and I didn't feel like loading coarser grit, then putting it back to the fine stuff. You see the basic port. It is as curved as the intake, and there is no easy way to straighten it.

Keep in mind that the larger the ID of the exhaust, the more it favors high RPM excursions. The Big Four have taken advantage of exhaust restriction to the point where they all run big headers back to a collector that houses a durable butterfly valve. Its position is throttle and RPM dependent. At idle, it is only open a crack; at WOT, it is fully open to allow for the fast expulsion of exhaust gases.

The black ring represents the difference between the port exit and the exhaust gasket. Note that very little material was disturbed.