your plants look pretty good, (maybe a teensy bit light green) one thing I noticed is that you don't seem to have a lot of aeration, if you re-use the soil I would recommend using some biochar as well as volcanic rock (either pumice or the red stuff), also it's really cheap and a super good idea for reusing soil to amend with slow release nutrients, greensand, fish bone meal, neem meal, kelp meal, crab meal, and i'd also add some oyster shell dust and shells to help counter the acidifying effects of the peat in your promix.
looks good though, it took me about three mixes to dial in my organic soil the way I like it, and i'm still tweaking it every now and then.
My "must haves" are my ecoplus pump, neem meal, crab meal, insect meal, kelp meal, a good mychorrizhae (xtreme mycos) and biochar.
Oh, and some mentioned blood meal, personally I advise against that, it's easy to overdue it, messy and stinky. It'll work, but I don't like it