First Photo Grow

I thought the yellow fade of the leaves was due to nitrogen def so I added a tsp during watering but haven’t seen any change with that but I’m thinking now it may be potassium since I started lowering it per the fox farm instructions so I am going to go back up to 2 tsp per feeding for the smaller guy. I think she’s just a little further behind in forming the buds since there’s way more white pistols than the big guy. Atleast that’s what I’m hoping. So I’ll go back to what it was earlier in hopes to remedy. Keeping the big plant the same as I don’t see any issues with that. A few leaves changing and dying but that’s normal for this late in flower.