You will get no better spark. The voltage regulator for the coils only outputs a set amount of voltage. It will store the correct amount, and only emit a certain amount. It will turn away any increase, because, after all, it is regulated.
So you pretty much wasted your time with that one.
O well, it kept me busy. The real test for me is when it is 100* outside and I am in stop and go traffic with the AC cranking. So far this mod with the big 3 helped my idle voltage alot. Which is the reason for my looking into this.
FOR SALE
2003 GTP, L36 swap, TOGs extremes, ZZP stage 3 heads, SSIC, ZZP Ported Blower, 3.0/3.2 pulley, XP hot cam w/ 105#, 42.5# injectors, N* w/ 85mm MAF, Meziere Water Pump.