i know what he's trying to do, but have been there done that wasn't successful, as you need to cut the fuel as well, i eventually gave up and bought a system, and you could adjust the cut time in mili sec for each up shift, quicker as you go up, it also cut the fuel and fed both fuel and timing back on in a ramp effect, the end result was absolutely no head movement during an upshift and no unsettling of the car even when changing up mid corner. only way to go with a dog or sequential box.
cheers John