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A 27.5 might also be a good size to try, and many people have had good luck with it. My bike is a hair on the fat side, but I did that intentionally. Very dark brown plug color, so it's not sooty rich, but any further and it will be. The 30 Mikuni pilot on a completely stock bike is honestly a smidge too big, and is roughly close to that 42 Keihin pilot size. It took a tiny bit more than 1 turn out on my mixture screw to get a good steady idle. Since you are, I am assuming, probably closer to sea level than I am, it should be just about right. I am at 1000ft elevation.
I wouldn't be too worried about the cat. I've been running a 30 pilot, 110 main, and set needle since day 1 on my bike. Not had one problem in over 600 miles now, aside from the catalytic converter getting so hot that it has started to boil the fuel in the bowl if it sat too long, and from what I understand that happens on completely untuned bikes sometimes. That cat radiates a ton of heat.
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