Can you take some pictures of your boat hull from farther back, so that we can see the overall shape of it?
Is the 175vs the one of those with the multiple curves in the transom area?
I don’t see pix 4 so I’m guessing that is the one that was too large to attach.
So far I would say pix 1 is the best option but it means trimming the motor up when you want to use the Si sonar.