Just in case anybody is looking here in the future, a few additional refinements which made a big difference.
When reaching out left from the roof flake to the sidepull there is often a tickmark on said sidepull. It's too low. You want to take the sidepull at its top where there is currently a rattle-stone.
When doing this reach out left, you can either do it with the heel on the flake or with your toe way out left. The former makes it easier to get the sidepull, but you do then have to adjust your foot immediately afterwards. The latter is more draining to start and more tensiony/corey because you're throwing your toe such a long way out left but you'll then move through the next bit slightly quicker. We opted to take the sidepull with heel in the flake.
On Sunday I had three redpoint goes falling off trying to get my left hand to good crimp over the lip. I was taking the poor intermediate crimp over the lip, shuffling my RF up the roof flake, then going again for the good crimp but coming up short. It was vital to also shuffle my LF up the roof flake in order to make the reach. An alternative which also works is to put in a drop knee for the left foot. I didn't do this myself but this makes it work for the shorter climber.
Once established on the lip crimps, the next move is a RH stab into a thin horizontal crack formed by a flake. This requires a reasonable amount of accuracy and I found it pretty vital on RP to place LF in the roof crack to get a more stable body position.