Quick Beats were popular in the early - mid 80s. They were probably second to the New Beats for a time. Here is a list of Zildjiian artists that played Quick Beats in 1980-
Interesting, Mongrel - my gigging hats are a 90's K top over a quick beat top.....
As for the OP, I think the holes in the bottom of the quick beat just let some air out making them a bit more crisp. I have 2 separate bottom QB's for sale if you want to experiment. They'll make any top a QB.......14"....PM me.