Mea Culpa for mentioning I used WD40.
Just like the "grinding" I used to free up the slot the WD40 seemed to work better at loosening up the sliding action of the miter gauge. I tried some light machine oil (in a can like 4&1 oil) but that didn't seem to help like the WD40 did. I let the WD40 set in the slot overnight then started working the gauge. The WD40 that came out of the slot was black so I know it was removing something that was impeding the smooth action I wanted. Anyway, the gauge now works great in the left slot and the right slot is not "sloppy" which was what I feared.
The mention of Boeshield T-9 was good advice too. I previously had cleaned the top with Boeshield RustFree then coated it with Boeshield T-9. After lots of elbow grease, RustFree and SkotchBright pads the table to looks "factory bright" and smooth as glass.