Humminbird has a solution to your hull type.
Get another SI transducer and put one on each side of the outdrive.
Connect the two with the AS SILR Y cable.
You will get right side SI, 2D sonar, and temp from the right side SI transducer and left side SI from the left side SI transducer.
The right side transducer is the only one that needs to be at the bottom of the hull for depth when on plane. The left side can be attached a little higher since Imaging is a slow speed function.