GHash.IO is back under 25GH/s now, and back to a 2x multiplier.

After watching the reward multiplier for a bit, this is definite:
- GHash.IO uses PPLNS where N covers the last 10 shifts.
- Reward multiplier is determined by the pool's average speed during the PREVIOUS round.

So, possibly a good strategy right now (until they change the rules again):
- Throw all of our WafflePool's hashing power at GHash for brief periods; rack up the share percentage in one round, and then cut everything when they switch rounds again.
- If we did this for one shift every 5 or 10 shifts, we could possibly  get paid out at 2x for the majority of rounds (as long as nobody else starts doing this).