Just in case someone MUST have an FET driver for the L6, I made a 30mm version of the Texas Avenger that would work with this light, although there is not any dual switch firmware for it at the moment so you would have to pick between E-switch and Tail switch.
Personally I think the stock driver works great for a performance standpoint but if you need either max power or a particular UI setup, well this is now an option.