I have 17 wareagle with 55 Terrova. Does a fine job 85% of the time. But I run 2 batteries for it to get the time out of it when trolling. On your boat you would be more than happy with the 80. Like Atimm said you could use kicker and steer with 55 which is what I do when pulling cranks with my big motor. But with the 80 you could lose the kicker and the weight associated with it. Set the ipilot and pay attention to fishing instead of driving.
One thing of importance is get the 60” shaft. Run it as low in water as you can.