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?
My Co2 is controlled by the PH monitor (the grey box on the right hand side) so even if it fails to turn off then it will never over load the CO2. all the wifi is doing is switching the monitor off and on.
Yes, it is looking good.I think its looking quite good now....I think i need to prune the plants at the front though