As the title implies, our 2015 KOP drivetrain is somewhat unstable. This is due to the fact that the center wheels are about 0.6 cm below the other wheels, causing one end to be 1cm off the ground when the other is touching. During assembly this was noticed and attributed to the different wheels we chose for middle and sides, but once we changed them all to uniform 6" wheels we realized that the axles are at different heights.
Is this an intentional part of the design or did we just horribly mess up? If it's intentional what is its purpose? If not, has anyone else encountered this or has an idea of our mistake?
When flipped over the top of the gearbox and the two outer wheels form a stable plane and the difference in height on the middle wheel becomes obvious:
http://i.imgur.com/z3tI1Sy.jpg?1
The CAD model provided by Andymark seems to have the middle wheels 0.35 cm below the others, but that still isn't close to this height.
The jags are powered with magic... - Aren Siekmeier [more] 
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