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We have an outdrive, which is similiar, they make very expensive fenders to rub against quayheadings. We tried using a fender but this wouldnt stay in the right place so have fitted a bathing platform which allows us to back onto a mooring with some more confidence but still try not to be too tight in.
We have an o/b on Cappy and have moored stern on. We tend to bungee fenders to the rear of the o/b to put some bounce between us and the mooring, then we drop the mud weight out a bit further and that helps hold us "out" from the mooring. Ok a bit of a step across or up but haven't had any damage yet.
We have found that where we moor stern on tends to be away from major wash areas which would push us back.