Originally Posted by
Andrew R Stewart
No mention of the frame's condition after the accident. Andy.
Since it's described as a "carbon fiber Trek", I would bet that any frame damage would be readily apparent. On the other hand, if it's one of the carbon-tubed, aluminum-lugged Treks, a loose lug could cause a wobble, but that's iffy.
The OP says it's stable with the old fork, but not with the new Kestrel fork. I'm betting on a change in geometry causing this.