Hey Clayton, I don’t have a mac so I’m probably not much help. I did ask around though and was told by someone that they had similar issues but this forum thread helped them:
Specifically the blog Linux sur les vieux iMac (2) – Installation du système de base – Le blog technique de Microlinux (Yeah, it’s French but the Firefox translation worked rather well for me and the eight article on partitioning might be useful to you).
If reading through that forum post and blog don’t help - can you post a few screenshots/pictures so I can see the issue you are having a bit more clearly?
Best of luck!
~Stack~