Wow, big differences in gearing between the LWSV gearing and FCB or stockish bikes.... you guys aren't short shifting those things are you. I guess you can tell when they run out of steam better than I can from my seat in front of the computer. Craig's bike is done by Mike Rich...so I know it can turn some rpm.
Probably the simplist way to jet a four stroke that seems to work is jetting it down till it falls on it's face...then go up about two sizes. And by "fall on it's face" I mean you put it in 2nd gear, crank it wide open for a few seconds...if the main jet is too small it will literally stop running momentarily....but it will be real snappy up to that point. For good power, just like a 2 smoke, you want to be as lean as you can be without damaging the engine...and still be able to run WOT at red line without starvation.
Intake is important...manifold must be reasonably well matched to the port, no gaskets hanging in the air stream, no leaks of course. A small "step" or obstruction in the intake can totally screw up air flow at WOT.
Guys like Pete T. can go through a bike and find all the little errors that add up to about 20 percent lost power. If timing just a bit off, jetting is just a bit off, exhaust a bit off, float level a little wrong, carbs not perfectly synced, plugs a little old, wires a little worn, cam chain a little loose...before you know it you've given up a big chunk of your hp.