I'm not going to tell you you shouldn't have been out there you knew the capabilities of your boat and yourself. People tell me I am nuts for fishing 5' swells in my 23' boat why have a big boat if your only going to go out when it's like glass? Plus I think it is fun skipping waves.
As for the shipping lanes, I haven't fished them but do pretty well on the trench. I heard there is a nice drop off but I have done so well on the trench I don't have a reason to leave.