John, I actually have an extra. I mounted a transducer on my electric trolling motor and don't need the transom mount that came with it.
Not sure what transducer you have or if this will work but if it is an external mount I think they are generally all the same.
You welcome to it if you want it. I'll be up on Winni on Saturday in Center harbor. There is a small chance that I will be up that way either Thursday or Friday as well.
Here is a image of what it looks like:
Regarding your 1st question relating to what you are seeing or in your case not and you may have already been told this but the position of where you mount the transducer is critical. It should not be completely below the transom nor above it. It sounds like it may be too high? Just a guess.
That's the baby, I just sent you an e mail in private.
What a web site, if you need help or anything for your boat, etc. you can find it here. I've been looking for one for two days, plenty of places wou;ld send it to me with a new ducer, no thanks. And Lowrance has an unsually high call volume the past two days.