Except for being able to hold speed going up a hill better, the problem isn't more power. It is the morons who really are out to get you.
My wife long held the opinion the problem with other drivers was because of the bus. So I started pointing out that they drive exactly the same around us even when we are in our cars. If the bus had 1000 horsepower it wouldn't do any good once we got behind a slower truck, and it sure as hell isn't going to get me down the hill on the other side of the mountain any faster.
If other drivers get you upset as much as they apparently do the best recommendation I could make is to sell the bus. Take public transportation and try not to look out the windshield because no matter what vehicle you are in they drive the same way.