there's another option....there was a velocity adjust hammer that I believe PPS did back in the day. It had a ball bearing in the hole of the hammer and an allen screw that was accessible through the slot for the bolt.
I do believe if you wanna do a velocity adjust on your BBA, WALZ does those. Something to check out at least.
Also: I believe Titus has valve tools to tighten the squared off screw inside the lower tube. You can check with him.