In my opinion your leaves were turning yellow due to nitrogen def. Though... losing lower leaves is expected during flower if your plants were bushy... they give their good ju ju back to the plant to power bud growth, unless it's excessive it's nothing to worry about. I feel like cal/mag looks more like freckles.
Your plants look great man, frosty as hell. Your Love Potion is sativa dominant ... if it was me I would use a microscope (60x-100x) to evaluate the trichomes. If you want the heady, energetic high you want to harvest when the majority are cloudy (not translucent!) before they start turning amber. Amber trichomes produce more of the couch lock, sleepy high... thought strain is the biggest determinant. Did you look up strain information and see the recommended harvest date? How big is your room, what is the watts per sq foot... or total overall? What is your growing medium? I'm a mix of perlite and vermiculite so I only flush 7 days from harvest. I've heard soil you want to flush for for longer... if you don't they say your buds wont taste or smoke as good. From the looks of it your killing it. I'm still fairly inexperienced but I've learned that I will constantly be tweaking things to see what works best. Right now I'm experimenting with independent UVB bulbs. I only care about quality... not in it for quantity. Depending on your reason for growing your decisions and technique may be different.
