If you go to a 10:1 planetary geared stepper then the feed rate steps will need to be 10 times as much and the oscillations will be 1/10 of the size, probably not visible at all I would think.

If you wanted to get inventive then you could probably try to even out the steps on your existing steppers by adding small resistors in the wires to finely adjust the current during the microsteps but that would be a lot of trial and error and take lots of time I think.