Within realms of 5-6gr you are fine. Remember your are trying to dose in excess of what the plants require, so dosing 3gr is probably in excess (level spoonful), so is 5gr (heaped spoonful)..so just dose spoonful's you will be fine. If worried about under-dosing use heaped spoonful's, the ingredients are cheap.Surly that depends on the density of the item your measuring ...e.g. my trace elements are heaver than my potassium therefore you would get a miss match?
Yes, it is looking good.I think its looking quite good now....I think i need to prune the plants at the front though