I had the same problem finding a board that had enough volume to get on your knees and dog in when the wind dropped.
Also had the feel more like my prone board without the hassle of a sinker start.
So Harro and I made our own full carbon vacuum bag EPS boards.
4'7" x 27" x 4.5" around 80 liters.
Plus we were able to use the latest hard rail design, and not wait a year for production boards to come out with them.
And for the record it goes unreal