Why are you not comfortable with it?
You could smooth it down really easily if you spent your money on a carbide cutter rather than a MT2 reamer.
Reaming out from 5/8" is a PAIN. NOT worth doing.
I drill 43/64" and ream from there. You're still loose on the top end, so I use small strips of athletic tape and Plumber's GOOP to fill the gap. You can NOT remove these guts to make any changes this way.
I had Flint Hills make me a 43/64" mandrel for my way of doing this.
Just how I like doing it. I wouldn't expect anyone else to like it. Look at all of the money I have spent setting it up! The mandrel, reamer and drill bit.
If I would have known how nice carbide tools would cut before I jumped into my other ideas, I would have just bought a square cutter, and would be using the Latta method.
I'll say again just for the sake of this wonderful discussion that I always get worked up about.......I HATE seeing crow call guts being JAMMED into a 5/8" hole and then sticking out the top! Not only do they look bad, the guts are not able to perform to their highest capability.
Parker