Yeah, I didn't realize that the ignition coil would produce so little current when I built it. I'll continue to keep my eyes peeled for an elusive GFI-less NST and will also try a smaller cap to see if that does anything (at least for starters). I'll go check out 4HV as well, as it's an active forum. Thanks!

Updated the post with more info. DerStrom8: It wouldn't let me add my actual drawn schematic, so I was working with the cruddy tool in here. Also, the purpose of the switch was to require an extra step to turn the thing on. (Step 1: flip the HV switch, step 2: get clear, step 3: flip the dimmer switch on the transformer.) @wbeaty: Thanks! That's great info and I'll check out that project as soon as I get a chance. Neil_UK: across the spark gap with nothing else connected at all. Attaching the MMC kills it so it won't even jump a paper's width.