Well... all of the above are options. I would start by doing one thing at a time. Is the idle pretty clean, or does it load up real quick? If its fast to load up, I'd go less pilot. If you've got a good idle, maybe lean out on the needle. You best bet is the ride and feel method, just play with it till its running good. Getting a really nice tan plug is going to be real tough under a lot of part throttle running... but if you can keep it from loading up and fouling out, and still making strong roll on power, your probably about right. Just my $.02