I've used that same exact mix, myself, many times. It's pretty much like you say... for about 4-5 weeks, just pH'd water with a good amount of runoff each time. After the mix nutrients are exhausted, I used Jack's 3-2-1 every watering and pH everything to ~6.5. It's pretty much inert from there on, so you're basically running a quasi-hydro system. I have no idea what the FF nutes are like, so I can't comment on them.