I think there is a bug or something unintended with this new set.
I stop strafing, cast a primary and nothing happens. No stack, nothing.
It happened quite a lot yesterday. I could literally stand still and shoot a primary 8 times and it only added one stack.
This may have something to do with it.
I never used the Calamity weapon. It happened with the normal setup others run with. Quite a lot in fact
Same with me stacks not happening