Good news.
Holly staff is not needed to make the blood staff, so it is OK that you have both of them now.
I did some testing and blood powers are working "correcly". You just need the right amount of SP / Endurance for the skill to appear. Once you don't have enough sp, it will dissappear from your list.
This is not perfect, so I will fix it to make the skill appear grayed out instead of dissapearing.