Or maybe it's just that the last 3 months *really* sucked. and this month is shaping up to be the same.
How is it the same?... and September being average 99.80% PPS seems quite a lot better than "*really* sucked"
The CDF[Erl] of 0.7642 means about 1 in 4.24 months (with 50 blocks) that's expected to be worse.
If the blocks is smaller, then it's even more likely.