I think the plants look relatively healthy, but they seem cramped. I personally believe that having more available space for your root zone helps to make bigger plants possible. If you're thinking of calmag deficiency, there is a fun way to check for available calcium, take some of your soil and some plain vinegar into a cup, if it starts to fizz then there is calcium available in your soil. Also i do know some people who feed their plants nutrients a few times a day rather than just once. If you have good drainage, you could try feeding the plants twice a day but lower the dose. Then they can receive a small feeding in the am and one in the evening. Happy flowering, your buds are looking great already. ✌️