Maximizing potency comes down primarily to putting good genetics in good growing conditions. Add appropriate fertilizers and soil mix, make sure they get lots of sun and thats really all there is too it. Potency is primarily genetic.

I allways laugh when any good weed everyone calls "hydro" and they somehow believe hydro magically makes shit weed potent and soil grown weed is shit.

You can grow hemp hydroponically it will still be garbage. Its all about the genetics of the plant being provided adequate conditions to realize its genetic potency potential.