I removed the setup again and made this splitter plate from .0025" Alclad.
It is not the nicest looking or best fitting unit but I am sure it should stop the turbulance and hopefully direct the air into the fan a little better.
The problem I think came in with the rounded edge of the "wedge"
I now need to make up the tabs that I will use to bolt the plate to the inside of the duckts.

Lets hope it will increase the thrust, after this I am out of ideas.....

Theuns