Need assist w/ getting S2+ switch to handle high amps

[INeedMoreLumens]

@savagemann

Any tips or tricks for getting this to work?

FET tailswitch:

GFS16 - Battery Indicator Tailcap Light & 1mR FET Tailswitch! (Rev B)

Hello BLF, TL;DR: I built a tailswitch system comprised of two PCBs, called the GFS16 System. First is a 18mm Taillight board which provides the regular taillight, and also features a battery sensing system to change the LEDs colours when the battery voltage is low (Rev B features 5uA standby current!). Second is a 16mm Tailspring/FET board, which allows replacement of the switch for a super low resistance FET, allow for the best performance in high current flashlights. All PCBs are up on OSHP…