Mike
You very well could have early signs or alignment issues. I spent some time talking to Don Higgins from Crew Chief Pro. His car had a slight bend in the rear frame. This took the rear out of alignment and tore up a lot of things. I would check for square as a start. Will the bounce hurt it, not most likely the case but I would not rule it 100% out. Have you had your builder take a look to see if he can offer up some advice?