I was forced to requeen both my hives last year (1st year) because both hives turned from really passive to killer bees!
I was stung fourteen times through two pairs of marigolds and a pair of latex gloves. They were on me as soon as I entered the apiary.
I killed both Queens and bought two new mated replacements.
So far so good. I have two super passive hives and mega productive colonies.
I had twenty or so play cups across the two hives late in April.
I’ve since added a shallow below the main brood chamber and so far no more cups.
My point;
There is a time and place for introducing new queens. Killing the old girls was heart wrenching, but it’s paying dividends now