Harry, I pulled the standard 50mm-ish end links out of the set up because they were hitting the chassis rails. The issue caused a slow oscillation similar to low air pressure / cut tire. I had originally intended to use rod ends like I did on the front bar. Even though I did it I don't like the way I have the sway bar ends attached, so it's possible they are contributing to or causing the problem.

I'll be revising the links along with getting the end play taken care of.

I apprectiate you guys taking the time to give me some feedback; I obviously have no problem driving it as is but fixing it should help the lap times.