We just fought this battle in NJ last year. We ended up getting some new no-wake zones but adverted the speed limit.
You DO NOT want to get into a discussion where you defend your NEED to go faster than 45mph. That will lead to a compromise at a speed everyone can live with, like 60mph.
You need to get out facts and figueres that show that speed has nothing to do with accidents. Point out the major cause of accidents, such as canoes and have then focus on them. Also offer the suggestion that everyone take a safe boating course. Don't focus on one group of people when everyone needs to learn the rules of the road.
Also, find out what bugs the people. Is it the noise? You may need to get some mufflers. If they don't take away your speed, then you'll need to give them something in return.
Listen to Troutly. Go in being a loud obnoxious person is exactly what they expect you to act like. Find some powerboating lawyes and Doctors to bring with you. Show the family side of your boating life.
Be smart, and don't get pissed. Being mad won't help your cause.