There's also a possibility the hard ballast tank is crushing the line in the rear corner.
Here's what I discovered during an FAE install (I hate to replay this again, but it is the time I most tore into my boat).
"Here�s the starboard compartment with the ballast tank removed.
If knew what I�d find, I would have pulled the tank with the fill-drain hose left connected. To get slack in the line would require disconnecting the other end of the fill-drain hose at the water pump. I did put it back in that order (in reverse). There simply is not good clearance in the hull of the boat for that hose to come out from under a corner of the tank. The tank kind of crushes the hose against the hull. I replaced the original nipple in the tank with shorter one to give the hose more of a run before it�s crimped at that corner. Thinking about it now, I might have given it a different fix."
http://www.wakeworld.com/MB/Discus/m...21/693846.html
I bet my starboard tank set up looks comparable to your port and starboard tanks. It's the side without the rear walkover.