While researching this topic "ph before adding nutes or after adding nutes" I have done a it a couple of ways. Ph before adding nutes then wait and check, or add nutes then ph. I guess it's personal preference, as long as in the end your ph is within range. The way I look at it though is if you ph before adding nutes and then adjust again afterwards, the ppms are higher cause of the adding of ph up (or ph down) twice.
Your water type also plays a roll I think also. Mine is well water and is usually ph 7.0-7.3 and ppm are usually at 40-45