I would ditch the Dow33 and get some actual oil for that RT valve. Mag orings need oil, not grease to keep functioning properly. Grease might eventually gunk it up. Any silicone based air tool pneumatic oil should work fine, and is dirt cheap. I use a 'special' kind called Super Lube. 'Gold Cup' oil used to be the old standby, not sure if you can still by it, but its basically air tool oil repackaged.
You should pretty much only use grease in the reg half of the valve; on the velocity springs, threading for the valve cap, and maybe some on the reg piston itself.
Good buy on the Micro, and with a Rotar on top all you need is a Ninja SHP tank for you to go full on beast mode!
Lover of vintage Automags, and fast women.