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omega_left and omega-right is the wheel velocity components already. You do not need to do anything with radius in your v_left and v_right. That is where the error is.
NOTE: Calculations are fine for a simulation, but in real life you want to actually measure the encoder response to real movement. Your calculations will not account for slippage and slippage could be significant depending on wheels, robot weighting and surface.
Spin the robot around 10 times to the right and see how many counts on each wheel, then to the left, then 5 meters straight forward, then 5 meters straight back. And watch the path - if you send it straight forward does it really go straight? You may need different multipliers for each wheel, or for different directions.
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