I've only tried one Mezcal so far: Del Maguey Vida de Muertos Mezcal Artesanal. I don't know if that one is very potent compared to others, but it completely overpowered Fever-Tree's ginger beer, which is amongst the strongest flavoured ones you can get..
An extra 2 cl of ginger beer made a better balance in my case.
I also used Fever Tree and the smokiness of the Verde Amarás I used was also too prominent. Totally agree with more ginger beer.