After reviewing all of your auditions, I'm here to put in my input. Mulligan is out of the question, his voice seems to be too deep for you to pull off. Lafayette isn't terrible, but it would need some work. Laurens is so close to being a match, it just needs to be a little lower. Phillip and Laurens share the same actor in the performance, but I do want the two to have different voices. Phillip's voice would usually need to be lower, but I'm willing to let the high pitched voice for Phillip slide as he is still somewhat young. So, in review, your best bet is either to go with Phillip or try for Laurens again with a lower pitch.