After using the Pink Panther woman print to determine that yes, I have significant Z axis wobble, I found the beefiest solution I could find. This is it. It’s a lower bearing holder integrated with a lower Z smooth rod holder. Like a heck of a lot of excellent Prusa improvements, this one is designed by Triffid Hunter. Thing 12785 on Thingiverse.
This not only holds the bottom of the rod still, but it takes the downward thrust off the motor. It’s beefy as heck too. I’ll print one for the other side now that I’m happy with it and then try the Pink Panther again, maybe in PLA this time. I saw that someone printed a Pink Panther at 0.01mm layer height. Yeah, 100 layers per millimeter. crazy.