I really think we need two things in this pool.
256 difficulty.
2 payments per day.(i thought we agreed this was ok before?)
anyway, since were not constantly mining the same coin, the "512 diff is the same as any other diff" doesnt apply now if we were constantly mining one single coin, that is different. but when we switch to 512k diff coins, and only submit one share in an hour, then it changes to another coin that is 1m diff, then we wasted all that work on nothing.
2 payments a today will not pay us more than 1 payment a day. So I think it is OK.
I do agree with your suggestion of 256 difficulty. I moved all my 7950 rigs away from this pool and have only one 7970 rig (total hash 2.9 Mh/s) here. As it is the only one can cope with 512 difficulty for fast coins.
I have a question about share mining. Is one share distributed in all the GPUs in one rig, or one share is mined by a single GPU?