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I stopped by a Raymarine dealer/installer and came home with interesting info. He installs the transducer on the upward stroke of the propeller for less bubble interference (contrary to the standard written guides by Airmar). The positive pressure forces the bubbles out. On most boats he installs it on the strake but with Whalers he sneaks it a little closer to the motor due to planing. 1/4" down from the bottom of the hull on the short side with a 5 degree angle. He eye balls the bottom of the transducer so an imaginary line has it intersect the bottom of the hull mid ship. He keeps the transducer flat and does not match the bottom of the hulls angle. My transducer is going on the corrected side.
Garris