I don't know if you can trim your drives down a little more or if that would upset your boat's attitude too much, but it's something to consider.
Also, it's always wise to inspect your props for cracks anytime the boat is out of the water. Pay particular attention to the trailing edge of the blades near the base, as this is where the cracks are likely to start. Use a good magnifying glass and you may be able to spot the start of a crack before it has propagated far enough to sling a blade.
Good luck with the rest of your trip. I'm looking forward to you and your crew's updates!