This evening I felt strong enough to do 6 sets of 100m with the paddles.
It didn't feels quite as tough as previously and very importantly I managed one set at 2:00min/100m pace and a few lengths at 1:58min/100m. Mid session I even achieved 2:05min/100m over 2 lengths without paddles, pullbuoy or other aids. That is a great result. Most of the time these less intense sets were around 2:15min/100m or a little faster which is probably an anaerobic pace but shows that I am getting better at applying power to the water.