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If the clutch slips constantly, that is the source of your weird power fluctuations. If your plates and oil are good, your cable isn't adjusted properly. This will solve problems 1 and 2.
Since you're located in California, has someone pulled the California emissions charcoal canister off of the bike in a previous life? They probably didn't cap one of the vents, or the cap is cracked. Check out the evap/emissions system. Also, if you're not starting your bike every 2 weeks or so, our ****** ethanol gas clogs carbs quick. Cleaning them is daunting at first, but if you go step by step it's actually very easy. I've got it down to about 20 min. Don't be skurred.
I've seen the brake thing happen with a bunch of riders -- They unconsciously change their body position when they apply brakes and it makes the bike dive one way or another. They swear it's the bike. The 250 is a very light bike and it doesn't take much to alter it's direction. Eliminate this suspicion by finding a parking lot and practicing braking. Start off slow with light brakes and work up to getting faster speeds and harder braking. Seriously seriously seriously pay attention to not moving your body when you apply brakes. Is the issue still there?
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