Tried EVERYTHING, Head Still Smells

[Sid at SailAway]

Ok, this has got me scratching my head, no pun intended! Lagoon 410, Here's what I've done..
1) Replaced all the blackwater hoses 6 months ago with ones from West Marine

2) Ran bleach solution done the shower drain which is a hose to a pump with no sump, seven days ago.

3) Ran bleach solution through the head intake seven days ago.

4) Tried the Raritan products in the shower drain and in the holding tank.

5) Opened the holding tank and rinsed it clean.

6) Vent is 1/2" and open.

7) Dyed the water in the toilet and flushed through looking for leaks using dry toilet paper on all connections.

8) Read and followed Peggy Halls book and suggestions.

The only thing that is not new is the Y valve and yet I still have smells. Could the hose have permeated this quickly?

Not sure where to go from here..suggestions welcome. By the way, the port head is fine...Go figure

Here's another thought, Our holding tanks get emptied every four days. Is this enough time for a product such as the Raritan products to work?