First watch Davide Sora's video, it's awesome!
and then...
C bout appears to be cut in too far from the edges. The first thing you should do is trim some more off the top of the plate so that the long arch template fits. That should help get the C bout lower and closer fit to the template.
Don't worry to much about the overall height, just don't go too low like 12mm like I did on an early plate which I had to scrap.
Then get the upper and lower bout templates fit as well as you can.
I use half templates, they seem to work out better for me. It gives some freedom to fudge things a bit.
My first one started out a bit peanutty in the middle like that but I was able to work it out.