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It sounds like your question boils down to "how can I fuse absolute yaw data from odometry and my IMU, when they don't agree?"

In general, my advice is not to do that, especially when one of the sources is subject to drift. You have two alternatives.

Try fusing absolute yaw from your IMU, and yaw velocity from your wheel odometry, or vice-versa.
Turn on differential mode for at least one of the sensors (probably wheel odometry).

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