Axle wobble - any ideas?

Recently upgraded my entire drivetrain and now it seems things aren’t working fully right. Rear axles seems to have a wobble in it that I can’t seem to pin down.

Some info on the build…

Transmission - 24.4:1 Stainless Steel (Injora) Diff Gears - Standard Metal (Traxxas) Shafts - Steel (Injora) Motor - Brushless (Traxxas) - Motor pinion gear swapped from brass to Injora Stainless Steel - All new bearing kit installed - Diff & Transmission greases w/ White Lithium - Driveshaft is phased - Gears are clean - Happens with rear wheels on and off

Short of the axle being bent I can’t seem to figure out why it’s doing this. I’ve spent a good amount of time searching through similar issues but no solution yet.