Sounds like the bike is jetted really rich, is the plug coming out oily black? In my '99 I run a Br8ev, a 165 main, an LTR needle and I think a 45 pilot, and the bike has been great up to around 8000 ft elevation here in Colorado. It's courious that you mention blowing bulbs in the headlight and associating it with fouling plugs, because I experienced a similar situation years ago. I've since put a Moose voltage regulator to replace the GG stock vr. I've not fouled a plug or blown a bulb in the headlight since. How are your reeds and topend? Those can contribute to some of the plug fouling issues as well.
Stan.