I have no experience in slower gains, on 20:4 diet. As long as you get in proper nutrition, you should be okay. Protein intake is important. I'm smaller now, but still strong. As long as you provide your body with what it needs, you should be okay.
I like to try this, but I don’t like counting calories.
I noticed if I use my fingers I can easily push back my fat pad and see lots of length that’s hidden.
Are you doing one big meal a day ?