I adjusted my headstock bearings because I figured they needed it based on how freely the chuck rotated. They are running nowhere near hot but now my lathe is turning eccentric. I aligned the headstock and have it perfect. I have less than .0001 over 10”. I purchased the lathe knowing that it had a noisy headstock but hoped it was just needing an adjustment.
I'm at the WTF moment.
Sorry.
You adjusted your headstock.. not because you had a problem, but because you felt the chuck should rotate more freely.
You didn't explain any problem.
You have gone the opposite way of what I would have done.
You loosened it, and made it ???? better or worse... worse
But now you think you have a bent spindle??? HOW
It's not easy, no it's NEARLY impossible to bend your spindle..
I would tighten your spindle back up, generally they loosen over time, not get tighter.
I have not read ALL the post, because I was so amazed how without describing a real problem you made an adjustment and things went bad, and now you are possibly blaming everything under the sun.
Excuse me if I am offbase.. My feeling is your first move was the wrong move.