Just a suggestion but what about having dedicated sessions for different classes ie all AA shooters shoot morning session. A, B, C shoot afternoon. I haven't done any maths but i think there are more AA shooters in a GP so this could stop the case of bias as Rob was talking about earlier in the thread.
Although this would say if your in AA class you must shoot a certain session it wouldn't bother me but some people may struggle. Hope this helps
FT WORLD CHAMPION 2016!!!