Running Rich

[Jacuzzi]

Here's a question.  I have a 2001 Marauder with a Stage 1 Dynojet kit and
Cobra Slip-ons.  I have 12,000 miles and suffer from running overly rich.  I
went to a hotter type plug, but to no avail.

I'm looking for suggestions.  Should I:
  a.. Replace the air filters with stock K&N's? $41 each at Competition
Accessories.
  b.. Change the needle setting to a leaner position?
  c.. Both?
Experience, opinions, I'll take whatever I get.

Thanks
Jacuzzi #2313