It seems we all complain a lot about hf20 these days.
The only thing, next to showing up all errors and miscalculations in HF20, is to remove our witness votes from the top20 witnesses, who all agreed to it and found nothing wrong with it. 
Not one opposed it. 
All went immediately to the next version. 
It looks as if T20 witnesses are super fast at code review and testing. 

But on the other hand.. 
You already vote for good witnesses and rarely any t20
No need for me to preach here.. Sorry:)