4096 Vardiff?  Seems rather... extreme.

How are you handling variance?  High enough 'N'?

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Edit: after almost 48 hours, I have earned a whopping .015BTC for 9MH...  My estimated totals were reasonable for a while last night:

Estimated total amount of coins for the current round so far: 0.03778934
Estimated amount from confirmed coins ready to payout so far: 0.02070382

(not great, but reasonable expected payout)

But now they are almost 0 again, without receiving any payout:

Estimated total amount of coins for the current round so far: 0.00280468
Estimated amount from confirmed coins ready to payout so far: 0.00066742

Definitely not keeping any mining power here.  Do you not have enough mining power for these high diff coins or something?  This utter lack of payout is unbelievable given current alt-coin profitability.