Dual transducer work great. The clarity of the pictures are much crisper without all that distortion. Crappiehunter68 gave me a lot of advice before I bought so I'd have to give him all the credit.
You got any pictures of the difference? Maybe CH68 has some... That is very interesting. I am tempted to do that to my boat.... What are the white plastic/boards that you mounted them to? Where did they come from?