Pretty sure slow would reduce the #of attacks, but maybe not the maximum number. Just reduced chance to successfully make the max number.

Advice: Stop trying to number crunch everything. No matter how perfect your calculations, RNG is still going to bend you over and rip your guts out through your tiny, pink anus. Just make a character you want to roleplay and stick with it. From there it is just a matter of figuring out how to PK with that particular character, because none of them are going to win every fight.