+1 for all the other options to loose weight. Galvanic corrosion on aircraft is a big deal on the CF airplanes I design. As with any machine that uses electricity, you don't always have the same ground potential between all the different components. Thus, you have some that have some small voltages present around the machine.
In practice, you can feel this in some cars when you drive them in dry climates, and they develop a static charge, then you get out of the car and ground the charge with your body and get shocked! This is your electrical source, same on a bike.
Regular water will do the job to help bridge the non-conductive parts of the bike so that these charges can pass. Salt water is a better conductor, buy regular water works too. Humidity will contribute to galvanic corrosion, so if you are in a dry environment, you would probably be better off than in Florida.
In aircraft, you never put aluminum rivets through CF unless they are installed "wet" with adhesive or some compound to provide isolation between the AL and CF. Ti is a much better choice for a metal that is compatible with CF.
http://www.corrosionist.com/galvanic_corrosion_chart.htmThe farther away from each other on the chart the worse the corrosion potential is.
That said, the plastic in these screws is probably the biggest worry in my book. Specially for engine parts.
