How can I get my LO to latch deeper in the C-curl position?

When my LO was under one month old, I first tried co sleeping in the C curl position.
At that time, I felt a pulling sensation in my nipple, which I think was probably caused by a shallow latch.

Now that my LO is 2 months old, I tried the C-curl position again because people here said it is better and safer than chest to chest sleeping.

This time, I felt pain along the outer edge of my breast especially where my breast is resting against the mattress almost as if I had been scratched. There is no visible scratch, but the pain gets worse when I press on the area. The latch also feels shallow, and I cant get enough of my areola into his mouth because I have less control over achieving a deep latch in this position than I do when we sleep chest to chest.

I would really appreciate advice on how to get him to open his mouth wider and latch onto more of the areola instead of just taking the nipple. What technique or positioning can I use in the C curl position to help him get a deeper latch?