I really would not even try to use any eq that comes with Apple or any other manufacturer that isn’t a serious hifi/audio engineering concern.
Proper eq’ing software is no simple task. It takes serious skill, experience and development.
Totally understand and I take the point. It has improved things a tad, but you're right; I shouldn't have to fix something that I don't like. I can't do anything now until Tuesday due to the bank holiday, so I'll give the Klipsches plenty of time to see if they grow on me before making any decision.