I have WCS too.
For the last couple of years I’ve taken a 24-hour reading a week or so prior to the medical.
My AME looks for an average reading of 140/90 or less.
On the day, he also checks (obviously). I’m not sure of the limits but I think he allows a small margin for WCS, on the basis that the 24-hr average is more typical.
I’m on a daily dose of 8mg Candesartan.
I agree with the bottom line above - getting it controlled and within limits is the important thing.
I have a class 1 UK CAA medical.
Hope this helps.