Imo I would mix up some nutes of balanced NPK 10,10,10 or what ever maybe add some epsom salts for mg but not much small teaspoonful 5ml in 10litres/quarts. Because your ph was way to low 5.8 is ok for hydro but in soil you'll lock out nutrients if its been like that for a while When you mix your feed do it at 6.8 and the soil will buffer it down a bit to correct the ph issue, 6.2 is too low in soil never mind 5.8 ,6.4-6.8 is ideal it cuts out alot of issues that are hard to diagnose if you keep the ph in the range.