Here is what I did. Using double sided tape I stuck some straight aluminium (or small steel angle iron) pieces to the bottom of the hull to push down the high spots and lift the low ones. Then a layer of CF inside to strengthen and hold. I did this on my Pursuit, Osprey and another hull. It doesn't make it perfect but it takes out the worst and means less fiiling and sanding. Just make sure to use good tape. It can be a bit of a mission removing it after but it works.
This was the other hull, very similar to the Osprey.
Attachment 163973