The SPL increased gradually too from 21 to 24. Nonetheless I kept focus as much as possible and completed in 24:22min a pace of 2:26min/100m. This is equal to my PB and barely a percent improvement on where I was last year:
02/02/18 2:28min/100m18/01/18 2:32 min/100m
05/03/17 2:42 min/100m
04/01/16 3:02 min/100m
26/02/15 3:40 min/100m
That's a success seeing that I had a few months break after this peak in July 2018 and then had to work my way back. Last year I did say that "I wasn't really trying", this time I was making an effort.
After this main set I experimented with bilateral breathing for jus 2 length sets. Taking a steady 59SPM I was slow and struggled to breath, almost with a dead spot. A higher cadence of 66SPM felt more balanced although the effort felt considerable. 63 to 64 seems best and with less leading-arm droop.