The "perfomance" mode on your handheld will advance the timing. However pulling 4 degrees out of the tune for a 75 shot would return minimal results.. I would leave the timing stock and just check the plugs after you run it and look for any signs of a lean condition.
You can wire it to spray anyway you want to. You can grab the instructions for your kit here:
ZEX™ - Instruction Sheet Database
so i was helping the guys wire the box for the n2o today and the green light on the box came on for a second and went back off immediately and wouldn't come back on. but i guess when i asked one of them to clean up the wires they decided to use speaker wire. not happy. i think i will take apart the box and wire it myself.