Everything is looking real nice. I'm very surprised they are taking that high of a feed. I'm on my 4th and 5th strains using Sensi and I haven't been able to go over 3 ml per gallon without seeing signs of over feeding.
I would still keep checking your run off, at least every other feeding if not every one. It's good to monitor it, especially since you're still new to growing. That way if it is going off, you'll know it before it gets too bad.