Fourth: Are you suggesting a drop in hashing power too, or not? I don't see that, so far.
Yes the HR is down, how can you not see this?
Hash Rate: 1,363,094,377 GH/s right now
It was ~ 1,550,000 GH/s at halving, had been inching up until halving, held steady for a short while after halving and has recently declined.
That is ~ 12%
Hashrate isn't steady - it fluctuates. It fluctuated pre-halving too: