One other thought, what exactly were the symptoms before "adjusting" the freewheel?
Most freewheels will hop around a bit when coasting. It happens on just about all bikes with FREEWHEELS from the top of the line racing bikes from yesteryear to the cheapest bikes on the market today.
The hopping or wobbling really doesn't hurt anything, and can be ignored.
Of course one can have other issues with wheel bearings or a bent axle, but those will have different symptoms such as a whole wheel being able to be wiggled.