Looks great dcd. Very healthy plants, nice and clean.
Your rate of surface movement looks very similar to mine. I don't seem to have trouble keeping CO2 levels up so long as I increase the CO2 injection rate to account for this.
KH/CO2/pH table can be a little inaccurate if you have acids present affecting pH, say from aquasoil. I think pH drop method is a tad more reliable in this case.