this just me but I do a lot of foliar feeding while in veg it works well for me,I also use a bit of super thrive when they are young ,it helps jump start the roots and gives nice fat stalks,,I grow in dirt the Led are great for producing crystals in flower but I like my fluorescents in veg ,I get very short compact growth from them,but would for sure start foliar feeding some if you are not already the plants can intake from it's leaves and stalk so it helps a bit,I see your plant has seven leaves so it health should be pretty normal or okay,anything over 7 leaves will be a indication that it's health is very good or happy,,I have 11 fingers or leaves on mine right now that are just around 3 months old,so this plant just may need a bit of time to fill out and come along,,I find plants are a bit like people,you may be feeding all the same but some may be better athletes than others ,some will grow faster or do better ,kind of like people some may be athletes some may be book smart ,just give it some time and keep at it will be just fine mate