You talk about cumulative hashrate, I talk about value client shows. Anyway, it have no difference: here is no logic in reward, now it looks like random - maybe 1, maybe 20.
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Of course, the total net hashrate. Not the hashrate of a single pool.

In the past, before the latest developments, the reward was under 1 when the net hashrate was above 80 mh/s.
Now with even more than 200 Mh/s the reward is much higher.
By the way, the reward is a reaction on the hashrate of a little time before.
If the hashrate goes up suddenly it takes a little time until the reward is reduced.
Same the other way.