The things I was focussing on went quite well, nailed most corners except first post quite well, but the real problems were not being fit enough, not being strong enough, having a cold, and having had 4 sculling outings since September, probably in increasing order of importance.
Not sure the 1s I'll gain from getting a bank party next time I race and taking the corners 2-3 feet tighter will help much... might have to do some training instead. (Peter)