I grow in coco as you know and use Master Blend. I've adjusted nutrient levels for flower as MB is a 3 part mix with magnesium sulfate and calcium.
The first time I eliminated the extra calcium which is 15.5-0-0 and MB is 4-18-38. I assumed this would still give the plants enough N but the fade was dramatic. Next I switched to half strength of the calcium and so far this has worked well. Lowering the chlorophyll making ability giving a better finished taste and not yellowing out by harvest.
Another reason I like the salts of hydro, no waiting for anything to be broken down and made available when needed