What's your water source?Tab water has to many of the wrong minerals in it.
Chlorine,calcium,haloacetic acids chlormines copper lead and so on. Use distilled water .It has a PH of 5.8 to 6.5 But check it anyway befor and after
you put the nutu in.AND ONE THING TO BE SURE OF IS TO CALIBRATE YOUR
PH PEN IF YOU ARE USEING A PEN.Calibrate all your test pens,EC,PPM, PH.
the right nutrs are a must to get the maxs from your grow.You have the right idea about useing the nutrs,start with less and build up to a stronger solution.
Hope this will help you,that's about allI can think of.Good Luck and keep us posted it