Tawd 48 AM, not sure what the PM session brought, apart from 'not enough'
For proper analysis you should remove a % of the top and bottom scores and look at the median point. But I don't think it will tell us anything we don't already know... some days have an easier session than others, some sessions have harder bits for a few and some have an easier ride. If you keep doing it enough, the sessions even out I think. Generally I think the PM sessions are harder to a degree, probably more so on open shoots like Wales, Harriers and Sywell... but that varies between nothing and a lot and shooters will buck the trend (Costello at Sywell)
I pick a session normally for ease rather than a tactical advantage... but I have picked sessions sometimes to avoid problems at grounds (like really windy exposed plinking ranges)