First time grower

Just started my first grow end of August. I have three jack herer auto in a 4x8 vivosun tent under 4 Groplanner GP 1500 led grow lights. 6 inch inline fan and carbon filter, 2 ocilating fans for air movement. Plants are in 5 gallon fabric pots and used fox farms happy frog soil. I use advance nutrients to feed the plants using there chart but do not use the amount they recomend. Tent stays around 77 degrees and between 55 and 60 humidity. I have runs into some issues with the plants at the beginning and because of that they are not that big and are now going into flowering.