Ean is onto it, but out of interest does you outboard have a fin of any flavour bolted to the anti-ventilation plate?
You mention cable steering which for all intents and purposes is direct 1:1 attachment to the motor. If you hit a tidal eddy and the load is then amplified by a fin on the leg you will never be able to resist the reefing on the wheel... A fin amplifies any differential load one side of the leg to the other.  Hydraulic steering may indeed have helped with the issue at hand combined with more river knowledge.  
In my experience what happened to you is not that uncommon in narrow boats (think wahoo/hooker dories) Spend a few years in one and you read the water very differently to something with more beam.  BUT narrow beam is why you can get away with minimal horsepower and still have good performance. Everything in boating is a compromise. Which is why you need at least three boats probably more 
Steve
				
			 
			
		 
			
				
			
			
				'95 130 dual cab fender (gone to a better universe)
'10 130 dual cab fender (getting to know it's neurons)
			
			
		 
	
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