Progress seems to be coming slowly, although I am still quite far from my former PB.
What I noticed is a little strange. The "one-breath-inbetween" CO2-tables had a rather negative effect on me. Instead of delaying contractions in statics or dynamics they now came way earlier, at 1:15 instead of 2:15. This is not what I desired, but at least contractions seem to be more gentle during the first minute of the struggle phase.
So now I don't do one-breath-tables any more and my contractions begin at 1:30, hopefully I can delay that even more.
I went from getting no contractions for 3+ mins to getting them shortly after 1 min since I stopped training much. No idea why - I'm having to take a break from training for a few months at the moment so cannot try new things nd report anything back :-(
Are you sure you weren't hyperventilating more before though?