I wouldnt trim leaf, you took care of it... leaf is still very productive and healthy so leave it be. There are a ton of different nutes, all depends on whats avail where you are. I am presently using 2 different ones, people will make fun of me for the second one but its ok.... trying Fox Farm products on all my plants but 2 ( so far so good ) and was told to try miracle grow for tomatoes, I will honestly say this shit is AWESOME for veg, creates huge stalks and growth is crazy, both the 2 plants I am testing it on are over 4" taller than the other plants and the stalks are almost twice as thick, its truly sick. I wont use it on anymore till I have a chance to find out the final product, but had a few friends tell me it worked well, so far amazing.
Miracle grow for tomatoes npk is like 20-18-18 something like that, I feed it at 60% recommend dose. started around week 2