I get surges all the time...really
I am tied up on a comercial dock, 25' under me, on average, so when the swell is running, she prances...
The water literally moves along the dock about 6' back and forth. The only workable solution for me are long, stretchy spring lines. I dont mind the boat moving, a few feet at the most, but if you let her pick up speed, she will ripp the lines and take the dock with her. So, the idea is to dampen the motion, without presenting anything hard to oppose it. Spring lines do it best... and vertically hung fenders, allowing the boat to roll.
You use loose dock lines as well, I assume?