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Mine is the 6 1/2 offset. That is the size they recommended for 17 Montauk. It works well for me, but I could see an advantage to the 13” in that it would be eadier to tilt the motor up. Mine tilts up fully but must be turned to one side and you have to reach down to the stop to un lock it.

I did use some stainless steel backing in the area of the boat behind the access hatch. In the area above the step I backed with some 1/4” starboard and washers. After 2 years of lots of use of the 9.9 Mercury trolling it is still solid.