Having some trouble finding the Coc page so i'll just post here, seems the amazon class needs to have the cost on one of the skills reduced to allow all of them to be acquired.
When trying to use it as a stepping stone for a bleed build you can accidently ruin it by selecting more than one of the middle skills. Also, is 20 skill points meant to be the maximum?
If you have a link to the page for the Coc mod then please leave it in a reply.