I don't care about jewelry, I don't use it. But you also nerfed how much base damage bash did when not interrupting. If you are using it just for an interrupt, it doesn't matter how much damage it does. It's utility.
But if you spend points to make it something you can spam and double it's damage, it still costs stamina, so what purpose does the Deadly Bash passive serve, if a bash still does less damage than a swing?
I'm going to spoil it for you. It serves no purpose. You have passive that should never be taken because you've removed the ability to convert bash from an interrupt into a stamina using attack (which was obviously the intent of the passive).
Base bash damage needs to be restored. Or add a new passive that grants a damage bonus after interrupting an attack or blocking a charge attack, a big one that lasts for a good 10+ seconds.