JPL Richard did a wd-40 drip for the shapeoko. Seemed to work pretty good. I’m not sure it will help with precision, but might make you be able to push the machine a bit more.
If you haven’t yet, I highly recommend the single flute for aluminium. Winston mentioned it a few times in videos, and I had to order something else and figured I’d pick one up. Wall finish from the tool is pretty amazing. You might want to do finish pass on flat surfaces with a flat endmill, but otherwise that bit is pretty great.