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If you are going to use Goop, first rough up the inside of the hull with some course grit sandpaper. Put a glob down, let it air out for a couple minutes (so some of the solvent can flash off) and install the transducer directly into the Goop. Use duct tape to hold it in place when it cures. You might get little tiny bubbles in the Goop, but they aren't really that big of a deal. I've always been able to track small leadheads down 100 feet with this method, even with inexpensive fishfinders. I'm not sure why you would only be getting temp readings. Might be a setting on the finder? Was the yak in the water when you were testing it?
Most people who use the foam cutout are doing a wet mount application, in which they Goop the foam cutout to the yak, put water into the foam cutout, and place the 'ducer directly into the water inside the hull. It gives good readings, but you need to make sure there is always water in the foam. I wouldn't recommend doing this method with the Goop in place of the water though. The Goop is a solvent based adhesive, and if you trap it in between the hull and the 'ducer with the foam, it might not ever cure.
The straight Goop method has stood the test of time, it's easy, and gives decent results. Unless you are stepping up to a very high end sounder, it would be my preferred method.
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