If only DC10, I cannot remember the last time the actual CONTROLLERS were asked their thoughts about altering the TSF's either on an hourly basis or permenant basis.
6 string - I can see the reasoning behind the AS to D2, as it is a 'compromise' the union fought for to enable more of us getting our 4 days off. Why then more flexibility for spins hasn't been agreed to cover this shortfall you mention is unexplicable. All that is needed is 1 or 2 more either D5/6/7's (whatever your bank) and you can last at least until 9, or 11pm on southbank. But then that means all watches needing about another 2 or 3 controllers, and that vicious circle starts up again....
As for saying sectors CANNOT be bandboxed at 8pm, then you have to make sure that flow has been applied so they WILL be bandboxed at 8pm. So what about the delays, THAT'S NOT YOUR PROBLEM - an airprox due to being overloaded is (in part). Don't break your back due to feeling guilty about the delays, management put us all in this position, its about time they started facing the consequences of their actions.