Concoction weird behavior with Crank Gun

When you use pots with Concoction trait on new Dwarf career, ultimate doesn’t keep up recharging faster than the crank gun wastes it. What doesn’t happen if you drink the potion of speed and concentration separately.

Doesn’t the trait make the potion less potent ?

Like it decrease the time length and the augment ?

It decreases duration, but not potency.

Supposedly