Hey Zoom Zoom, I feel your pain. I have made a couple of different FET drivers work… But, it is not nearly as easy as a 105C. First, I would suggest a very complete read of the GITD Tailcap thread.
At this point I could say or type something that is not 100% correct, but there are folks on here who can correct me! I took the leap and made the BLF A6 firmware work, it has long, medium and short presses involved. These presses are measured by looking at the voltage decay in a capacitor during the off time involved in mode switching. Adding a bleeder resistor causes that decay time to change, it slows the decay. The stock values will not work, you may not be able to change modes, they may change on their own or you may not even be able to turn the light off or on. There is firmware in our repository that displays the ADC converter readings in a series of blinks. You will need to load that firmware and characterize your capacitor in your install and build your off time profile based on those numbers. While you are at it, if you have LVP you will want to calibrate you drivers firmware to the ADC that measures battery voltage so the LVP shutdown happens at a known and correct point. In the GITD thread, I posted some of the issues and solutions to the problems that I had making the combination I was using work correctly. It is still not perfect and if I ever remove the driver I will refine the numbers further, but I am close!
While the GITD tailcap is pretty cool, it may not be for everyone or every driver. The learning curve can be steep, I know it was for me. It is very likely that the driver is not at fault, but it could be and without testing it… it would be hard for any of us to be completely sure. The GITD thread would be a great place to learn, document and comment further and I will get eyes from folks that may not catch your problem in this thread.
Matt