Track control arm is a possibility and swap your LF and RF as some belts are just picky about speed/direction for a wobble to show up.

Last but not least also do "road force" balancing....
http://cloud.tapatalk.com/s/5e6cc997...WA0003_001.mp4

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course