In this, my third event in the VTTA 10 mile Zwift TT series, I tried to maintain a steady power. I also tried ride this as I normally do road TTs - that is, at a very low cadence. This worked marginally - I seem to have improved by a piffling 4 seconds! At this rate I may have cracked 24 minutes by the end of the 8 events!
Just before embarking on my warmup, I figured out why I couldn't reach top gear - it was a problem with the placement of the outer gear housing. In retrospect, being able to access the two smallest cogs was not helpful!