To answer some of the questions asked so far in this thread:
wheels-
http://www.vexrobotics.com/217-2903.html
Al- we did get it cleared by an inspector before going into our next match. Where it was located it was set on a frame member and had a secure frame member both on the back and a side. Regardless, point received and understood, we will be sure to use a more solid fastening system next time, thanks for your concern.
I could be wrong but I'm pretty sure it's a 1/8" drop right now.
As to how the wheels are currently mounted, it's a similar setup to the way the kitbot wheels are mounted (dead axle through holes in our c-channel frame.)
Lil' Lavery- I couldn't give you an exact location but it is close to the center of our robot, so moving the CG forward or backward slightly is something we can look into. Our CG vertically is another point of concern (hence the discussion of ballast) as our robot is underweight, about 95 pounds without battery and bumpers. The majority of that weight is very low, but the shooter assembly (25lbs of weight centered around 40") as well as our hanging system (simple pneumatic cylinder with hooks) and the supporting structure all may be contributing to the tipsiness by raising our cg.
As for a picture, I don't have one on hand that clearly shows our wheel setup and our robot is in a crate currently.