400tx/s?? What are you talking about?

It it a typo?

How long since the solo pool someone found themselves a block.

Bitmain just announced that it has finally developed a better ASIC chip. It will be 42J/TH. Bitfury also announce that they have a new ASIC chip which gets 55mW/GH. https://www.coindesk.com/bitmain-ceo-announces-new-7nm-bitcoin-mining-chip. I put in some figures, and it appears at the current difficulty and 5 cents/kwH price in China, that brings the electricity cost down to less than $1,500 USD to produce 1 BTC. If the difficulty doubles, it will still be less then $3000 USD to produce a BTC. And I suspect some of the larger mining farms in China are getting a better deal than 5 cents/kwH. Therefore, the break-even floor is going to be lowered.
However, I really don't think BTC is going to go much below 5000 USD. After all, Bitcoin core just patched up a major bug that was present for almost 2 years, and the market responded like it was just noise.  

"A distributed system is one in which the failure of a computer you didn't even know existed can render your own computer unusable”

It is bad because anyone with half a brain now knows that Bitmain holds one million Bcash lol that it cannot sell.  This is a massive stock overhang.
https://moneyweek.com/glossary/stock-overhang/
In other news:

So why this drop  

chart patterns can be found and matched to anything. it's just a matter of the correct zoom and time frame.
all this comparisons and chart predictions reminds me of this movie:



A merit for the first one who guesses the correct movie title.