Shaft length or motor trust?
I have a 90" Kraken but not installed it yet on my 306 Canyon, however 90" schaft should be more than enough for most conditions.
If prop het lifted out of the water by wave action then it's probably time to go home.
Garmin has newly also a 110" shaft but it's absurdly 2000$ more expensive then the 90" shaft version and the 110" version may be too long to store on the gunnel.
Motor trust is about same for all top models and brands and the Kraken moves bigger boat than the 306 Bimini/Canyon.
Most trust comes from 36V batteries.
Minn Kota has one with auto deploy feature what avoids that you always need to walk to the bow to deploy and retrieve the TM and it seems MK solved the initial problems with it.
Chris