Ducer
Transducer for the sounder should sit just below a line extending from bottom of the hull, in the spot where mounted.
Usually that would be a foot or so to the side of the centre keel etc ( in an area where it gets clean flow of water )
If you are getting a good reading at full throttle then it should be mounted low enough?
You should be able to find pics of placement and maybe even on a boat similar to yours, if you search "transducer mounting" or similar on here or just a general search.
Mick.
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