Hi David,
as Neil and Jonas say, break the depth and time into manageable chunks.
Don´t try to "catch up fast" if you get a little behind but keep the whole thing smooth and under control.
Get a little ahead, just stop or slow down.
Don´t get sucked in to staring at your guage.
I needed a long time to develop a "feel" for my Ascent rate and it varies depending on vis, water colour, particles, available light etc.
It´s also a skill that for me needs constant refreshing after even the shortest dry time.
HTH
Devon Rob
Quote: (Originally Posted by
neilh)

E.g. 18M -> 9M in 30s, then wait for 30s
I´d try not to get into the habit of sprint then stop... stops
