You definitely have nuts problem ! How long are your plants in veg?

Maybe you have overfeed them .

Little advice : learn on mistakes that others do ! Knowing your ph is very, very important . For your plants sake , remember that

You said that you don't have ph meter ! Use litmus paper or ph detection fluid . Its not so accurate like meter but will do ok.
Because of lot ferts that u use , i think knowing ph should be on your priority list ( on 1. place ) .