What is the OG/FG?
Wouldn't the amount of residual body affect how you want to carb it?
Any of my ordinary bitters, I wouldn't want them carbed near a pale. I tried a bottle last night of one that I overcarbed, have to spend 5 mins swirling it to get it to taste/feel right.
I don't think it really needs to be that highly carbonated, maybe just a bit above the real high end of carbonation for bitter. Around 2.4, 6g/L or 25psi I would be happy with, wouldn't go any higher myself.