Well to test your theory I just took it out to get the mail (my mail box is almost a mile away) and of course it was on good behavior. Had no problems getting it moving with light throttle... It still bogs, and like you say, it's only under 1/4 throttle. By bogs, I mean, you'll just hear that low brrp sound, like its almost at an extremely low RPM. It does not do it noticeably once moving, however. I'll get a compression tester, but wouldn't low compression have other symptoms? Because it's certainly not lacking in power, I've even compared it to other banshees. It really hauls ass. I get even exhaust pulses out of both pipes, though one pipe seems to accumulate more carbon than the other for whatever reason.
Though I do worry that whoever put all these mods on it, didn't up the jet properly to compensate. Maybe the reason it's fast is because it's running very lean. I'm not sure, gonna have to test compression and open up the carbs and have a look.
Thank you very much for the help, it's highly appreciated.