I have a 34 Californian with twin 85hp Perkins, so I am 'speed-challenged'. In a beam sea, it's very rolly, but in a following sea, the wallow sets in. Unfortunately, I don't have the speed to outrun the overtaking waves. The square stern seems to aggravate the condition. As the boat rolls to port, the bow wants to swing to stbd, then as the boat rolls back to stbd, the bow wants to swing to port. I might be misreading the causes, but I can attest that it's a handful at times.
As mentioned by others here, staying on the heading and anticipating the boat's response helps greatly. Sometimes I feel like a bigger set of rudders would give me better yaw responsiveness, but no rudder will eliminate a boat's tendency to roll.