I don't think 1604 is low enough to help. Needs to be about 1000 to atttract the multi-pools because the price has fallen too much. So, another 8 slow blocks, unfortunately.
Seems you're right.
I wonder how the wallet calculates the networkhashps value one can see with getinfo cmd. Because it seems to be very far off reality.
With 3.6GH/s as displayed the network should find a block about every 15 minutes, if I got the math right. In reality the last block is now almost two hours old.