My apologies - I didn't acknowledge what is a very good point. Yes, setting the eccentric to its lowest would indeed help cornering by lowering the C of G slightly but it would also lower the pedals, which have already touch down a couple of times on uneven surfaces.

Another consideration is that at my low level of expertise any gain would be theoretical. With lots more practice I might one day go that way... a long way off, I reckon

This is the best video of a trike cornering I've found - at the very beginning of the video and from 7:40 - turn the volume down as there's lots of wind noise :
https://www.youtube.com/watch?v=pt4_PHCInk8