I have the newer reels and I have seen density build at the edges where the film is in the guides. I have since read in an old Jobo publication that the solution to this is to only use 4 sheets instead of 6. Leave the center slot empty. I always used the baffles. I used speed F on the CPP2.
I solved the density problems when I ended up with a 3010 expert drum in an auction for an ATL2000. This helped me out, but won't work for you with the CPE. Try only 4 sheets if you have problems.