Throttle cable addressed again, fixed!
Got slow today at work, I pulled in my ML and did another oil change, fuel system cleaner, knocked dust out of air filter, topped off and inspected things, pulled codes (none), rotated tires again, and fixed that pesky throttle cable. I replaced it again, and on the way home it finally felt completely smooth! I lubricated the old one before replacing it, which made it "ratchet" far worse than it ever had before. At that point I tried another new one and am happy with the result. On the down side the tire edges are feathering quite heavily and I discussed replacements with my manager. I will have to see our SPOM about it, but remain optimistic about getting some help towards a set of michelins.