The 3 keys to solving intrusive headrest angles are:
1 Reposition the torso
A headrest should NOT push your head forward!. To remedy this problem, something has to be repositioned: either the headrest or the body. One day, hopefully, more vehicles will have headrest tilt-adjustment. Any attempt to modify a headrest is not a considered solution as it compromises its safety functionality (read more about unsafe headrest modifications).
The solution is to reposition the body, namely the torso, to create an ergonomic neck alignment. We achieve this with our innovative cushion design as it works in conjunction with the seat-tilt function. This brings pain relief and creates comfortable seating. 
2 Safety
Keep the headrest in place for whiplash protection. The product must not compromise this safety functionality.
3 No additional pain points
Our cushion doesn't interfere with the hip and thigh placement on the seat. Moreover, it offers some lumbar support. Read more about other ineffective seat cushions.
Final thoughts
Further insights are provided in other blog posts:
"Understanding Neck Pain: Causes, Treatments, and Prevention"
1 comment
This pillow is so comfortable in my car. The headrest pushes my head forward and gives me a headache. The sides hug around causing my shoulder to come forward and be rounded. The pillow allows me to sit straight and not cramp my neck and shoulders.
Now I am going to order another one for our other car.