what should the toe be?
As others said, 1/16” (Max 1/8”). Castor shouldn’t matter as much for the wondering as far as I’m aware, that’s mostly about “return to center”. I like my 33” KO2s at 26psi, higher definitely felt more darty as my tire size has increased.
The trackbar/drag link look to be pretty close, so I don’t think it’s bump steer and I’d start with the toe+pressure.