ARSbitcoin and their SMPPS seems to be very good and so far has "survived " having a negative Buffer for short periods.
Patience, it will collapse eventually (unless something happens to the pool due to unrelated matters first).
I read your predictions about ARS and the negative buffer a while back.
I guess it all comes down to luck and patience of the Users.
or maybe Burningtoad will change the system before it happens as he said he might.