Yeah, I understand your situation with sound - it is literally what I always do. I promise to 'work on it by myself' and then 2 days before deadlines I realize there is no way for me to do anything that would work well :D.
About the debris I am really not sure what could work best. It is just at certain speed there is already to little time for reaction - if the first arrow misses - then well, you die :D.
Good luck with all the changes! I will be happy to play the game in a while to see what changed :)