Carl Alberg designs are legendary for their steering instability while motoring slowly astern. Will it go port or starboard? Toss a coin!
One of the great features of having an outboard in a well is the ability to rotate it for steerage while motoring astern at very low speed. Tightening the rotation friction on the engine to prevent it from wandering around while motoring forward prevents rotation in reverse. So, if you use this friction adjustment, you must reset it constantly. And at least with my engine, the friction can't be set tightly enough to stop wandering while underway.
If grease from the rotation housing ever contaminates the friction adjustment, the adjustment becomes completely ineffective.
Here's photo of how I solved the problem.