I just plotted the HFTA analysis and VOCAP predictions for my chosen summit and was interested to find that (in general - stange conditions not taken into account), 40m before UTC Midday is a better option than 20m after midday. According to VOACAP good coverage using lower power is possible into North & South America on 40m up to about UTC noon from 0700 UTC.
After midday 20m might open up between Europe and only the east coast of the US & Canada but at a lower strength to 40m in the morning.
Of course with the time difference UTC morning is still in the night in the Americas, so as usual propagation may be good but if no one is on (or in our case out on a summit), you wouldn’t know!
Good luck to all taking part in any case.