I have the motorguide bow mount model SW82 Digital 60 inch shaft. It develops 82# of thrust and it is the 24 volt model. It has a variable speed control twist grip handle marked 1 through 10, 10 being full thrust, and I rarely run the motor past 7 on the scale, so yes I think that it more than adequat!
I'm using this setup in the pacific ocean with current, wind and backwash to boot. This motor gets the job done.
When I first outfitted my 21SE, I had the foot control model but I changed it out to the hand control model since I was standing while fishing and the hand control is more convenient while standing.