I think the reason why the difficulty stayed the same is because if you look at ETH hashrate, it went up by 300,000MHs, which is about 15,000 280X, each 280X uses about 175 Watts so about 2,625,000 Watts which at 0.50W/GHS is about 5,250,000 GHS.
So its accounts for the 5PH/s loss in BTC hashrate.
well we are - 3.49% that is about 38.39 ph
there are multiple factors
ETH grew
PPC grew
Weather is warmer not then the jan 22 to feb 14 runup
Unknowns------ Ghost cities in China with ghost mining
A chinese farm did get busted stealing power.
Someone had a 3 week 1 cent power contract and ran older gear for the Jan 22 feb 14 time solt.
Then turned the gear down
Just don't know whats up.
https://bitcoinwisdom.com/bitcoin/difficultyBitcoin Difficulty: 163,491,654,909
Estimated Next Difficulty: 157,781,913,541 (-3.49%)
Adjust time: After 21 Blocks, About 3.6 hours
Hashrate(?): 1,193,634,996 GH/s
Block Generation Time(?):
1 block: 10.2 minutes
3 blocks: 30.6 minutes
6 blocks: 1.0 hours
we have 3 hours to go and we are at 3.49%
good luck to the close ones.