you should do a rdwc with a common res of some type and try a continuous meter. I love my bluelab guardians. But then you'd have to stick to one nutrient solution for all the buckets though which wouldn't be impossible I'm sure but depending on the different strains you run could cause a problem, but it def cuts down on your work. you're totally a candidate for an ebb monster!
when I was using mine it was sweet, I went from individual buckets to individual buckets tied to one common res which I mixed back to every two hours, You do all your adjusting there and then dump it back to the buckets (or coolers in my case).