Issues with Drivebase

[rainbowbear998]

After competing at the Australia regional, my team realised how difficult it is to get over the scoring platforms with the kit drivebase in the long configuration. As a result, we have now replaced our six 4" wheels with four 6" wheels on the ends. However, our robot now struggles to turn on the spot. At this point, we're pretty sure that the fault isn't in the code or electronics, but we've seen plenty of other teams use this setup with no problems. Has anyone else had the same issue? How did you solve it?