That's the way! They look healthy. They usually won't grow inches overnight, and they're not really old, the budlets look good. The 2nd pic is stretching more, they all seem to have light getting through to the bottoms. Let them see what they want to do then you can decide if you want to tie stems or leaves down again for light penetration. Bloom food-wise, can you ask who makes the soil you bought, or research the bloom product options for answers regarding what they work with or not ... read reviews? I know of bloom boosters but not about using your soil.