I run an high thrust '04, 9.9 Yamaha kicker (T9.9ELRC), electric start, no tiller, coupled when required by a tie bar to my main. It seemed logical to go high thrust, to me anyway - I had a high thrust on a sailboat at one time. Mine is a 20" shaft. I don't fish/troll, it is primarily my backup motor and, it also a good way just to puddle along enjoying scenery while conserving fuel.
Cheers - Dave