Pog difficulty 0
Is your thought is that 40 blocks and tithe=1 will have at least one tithe in that period when things settle down?
Yes, I think it might fill itself up (but-its a victim of its own catastrophic change however - spikes to 128,000 cause no one to tithe for large periods repeating the issue), but also, if we tweak the params during the next mandatory then the diff of zero wont really be zero (if 0 would requires 1 day coin age) meaning no catastrophic move from floodgates open to 100,000 diff in just 3 blocks.
But having the 40 block lookback itself - I think it has positive benefits - for people who didnt have a chance to tithe during the morning will have another chance (with 205, you have a flat line slow moving diff, with 40 you have 5 elliott waves per day).
I think all it needs is a max tithe amount of 3bbp and a min coin age of 1 at the lower end of the chart (diff 0). That would give us 20,000 tithes per day, people using up all their coin age if they attack, and probably 10,000 distinct users in the pool. The vol would drop to normal vol with these params (theoretically, it appears).