recirculating dwc w/ House and Garden, new growth is yellowish

House and Garden Nutes
700ppm
6.1 ph
65-70 temps

The new growth on my plants is light green to yellow and somewhat mutated. Stems on one plant are a bit purple up towards the yellowish growth. I assumed this was a difficiency. Since the yellowing emerged I have been doing slight water changes each day and pouring about a gallon of mixed nutrients at full/aggressive strength with a little cal mag (about 700ppm total) over each bucket, ultimately this gets recirculated back through but overall the ppm throughout is 600-700 ppm. Plants are about 2-3 feet and I just switched them over to 12/12 today. The yellowing isn't terrible but I think it should be dark green and not curled/mutated looking. Anyone have experience with House and Garden? Are the feed charts for a low dilution and aggressive strength not really that aggressive? Any help or insight from experienced users of house and garden are appreciated or if anyone has any advice.

Hey grate
I have no experience with House and Garden nutes, but I am going to assume that since they are on the market, they at least contain the major nutrients you need. And your supplementation with calmag would round it out nicely one would think. I use GH flora nova series currently with great results.
But this does sound like Ca deficiency, so there are a couple things you may want to look at: humidity..at 65-70 degrees you should keep your humidity around 60-65%. Much too high or too low can cause the stomata on your leaves to restrict or close altogether, shutting off transpiration and leading to a lack of circulation within the plant. This can result in calcium deficiencies because calcium is an immobile nutrient and must be taken up from the roots constantly. If there is no transpiration, there are no nutrients (i.e.,Ca) being taken up.
Too low humidity can also cause leaf malformation because the leaf will try to change shape to decrease surface area and curtail water loss.
Also, does your 700ppm include whatever is in your water before you add nutes, or is that the total (nutes+water)? If you're shooting for 700ppm and your water by itself is 300ppm, then you need to be at 1000ppm to give the plants 700.
Best of luck!

Oh yeah, also I had a plant do something similar to what you're describing once caused by the water level in the bucket being too high, like up past the bottom of the rockwool cube. Food for thought.