Lowrance Ghost. That comes from someone who all of his life has said, if it is not a Minn Kota, it is not a trolling motor. The ghost has thrust of 97 lbs at 24 volts and if you ever want or need to (motor problems) you can add a battery and have 120 lbs at 36 volts.
All my friends that have ultrex tell me that when there is very little to no wind, their Minn Kotas "spot lock" will move somewhat.
My Ghost does not move, no wind, little wind or strong winds. As far as bluegill fishing in shallow water, I have put Ghost on anchor lock and caught bedding bluegill within feet of the trolling motor.
With all that said, since you have Garmin depth finders and livescope, I might would go with a Garmin trolling motor. I have all Lowrance, the active target is ok, but from what you have told me and others also, livescope is better.
I for sure love my Ghost trolling motor though and have not even come close to running down the batteries, no where close at all.