High OG on chocolate milk stout

Thanks!

Hi,

I measured again 4 days later and it’s still at 1.023. I took a taste and it was very bitter. 3 questions:

  1. What’s making it so bitter? Too much sugar still?
  2. Should I put in more yeast?
  3. I haven’t put in the cacao nibs or moved it into the secondary yet. Will the nibs sweeten it up enough and get rid of the bitterness?

Thanks
John