Makes sense and I was using megacrop during veg then megacrop,liquid then dry koolbloom in flowerHonestly I'd say the struggle to keep it green indicates a 91 leaner. I don't think I've ever had an issue with a chem d cross, some variegation but not the way 91 just eats itself after week 4. Needs lotsa calmag if going the salts route.
No calmag used ..even in veg for a while it tended to be on the lighter side of green