Am I the only that has the impression that V8 was smoother?
I wonder though why New Macław posted that MaclawStudio's TWRP 22.214.171.124 or above is required to flash it.
Because he is accountable for what he says. And he can and will only assure that it works on that one.
With other recoveries it may...
I had a problem with earphones also.
Solved it with an app called "toggleheadset2" available at google play.
Check it out, should solve your problem also ;)