Thanks to all for your comments, observations and advice.
I managed to play some hands better than that one in the comp, fortunately, and it made little difference if any to the end result, as it turned out (lost a big pot v a similar stack AK < QQ aipf and had very few chips left at 600/1,200/100, so the extra 5k would have changed little).
Nevertheless, it is useful to know I made so many objective mistakes in a single hand
