Hi, don't worry, Caesium adjusted "N" to double what it was before (now 1*difficulty), making the "window" for payouts longer. So, your estimated payout is still ramping up - and the abrupt change of the "ramp steepness" moved you a little back. On the other hand, if you stopped mining, the payout estimate would ramp down slower.

The old value for "N" was suitable for a freshly started PPLNS scheme, but now that we've been running for a while it was sensible to increase it. We will probably increase it more in the future (up to a few times what it is now), but abrupt changes aren't good so we will look at gradually ramping N to the new value