Chris - I wouldn't say 'relaxed', but am struggling to find a word for it.
I'm trying to stay alert in case anything goes wrong, but not be so tense that all the control movements are jerky and mechanical.
I am definitely
not relaxed when coasting out over a large expanse of water!
I think after your experience, you'll be expecting it all to go quiet up front and for oil-induced IMC at any minute. Just keep going and hopefully it will all fade into a distant memory.
Or play the statistics game 'One failure in every xxx hours'. If you've had your one, then the clock has got another xxx - yyy before it's your turn again.
Or you could be like Baldrick and carve your name on a bullet, so that you know where the one with your name on is!!