CCIP I like your idea... must have missed it earlier. Even in the movies
externally I don't recall subs swaying back and forth.
They appear to sort of "wriggle" to near misses... which I think is much closer to the truth. One can think of a concussive blast wave as an "enveloping" sphere that jars its way through an object. (the u-boat) It would "flex" segmented objects.. (the u-boat)... not grab something by the conning tower and rock it back and forth.
Do it to it! I'll use it!
I hope you build it.