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From memory I used something along the order of Gain 21 and Offset 115 but it's been a while.
The idea is to increase your exposure times until the brightness levels stop increasing (full well capacity) and then increase the Gain until that is near 65535 ADU.
Even at 0.02s it looks like you're at full well so you can just use that. Increase the Gain until it gets to 65535. Then you want to do Bias frames and set your average Bias ADU around the 500-1000 mark.
As Rob says, it is best doing this with the cooler on as the bias levels do change with sensor temperature.
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