Hey DJ, hows it goin?
Girls look great. What is the smell like on that Critical Hog?? Is it closer to the Berry flavor of the critical, or the Greasy of the Hog?
First things first..those funky one-blades, they are not a good sign at all. It means that there are significant light leaks in the veg room or simply not enough light. I ran across the exact same phenomenon with Black Russian from Delicious when i tried to veg them with CFL's. It took me 2 generations of cloning to get them back to normal. Get those lights closer and add more light if you can without messing up temps.
Next, after going through your thread, I was a little concerned to see that your vegs are at aroung 1700ppm? IMO thats too high. Im sure your aware of this but with hydro, nutes=money; so use as little nutes as possible early on (300-700ppm) and really spoil the girls in late flower (week 3-7) with carbs and bloom boosters heavy in P & K. This will also help keep the res mostly clean til you start adding those heavy feeds at the end.
Lastly, Im concerned that you may not understand fully the concept of flushing. In a normal capacity (outdoor soil), where there is already a fairly high EC or ppm naturally occurring in the medium, it absolutely is appropriate to flush with damn near '0'ppm. However, in Hydro applications, many growers, myself included, believe that a '0' ppm flush is the wrong way to go. There are a few threads i saw on here a week or 2 ago about this exact topic, but the basic theory is that due to osmotic pressure, you dont want the ppms of the res to be alot lower that that of the internal workings of the plant. This situation will cause the root-ball to leach the nutes back into the res hiking up the ppms and ph, instead of encouraging the plant to simply metabolize what is left internally. Your initial instinct to "flush" with a low ppm (150-250) for the next 10days-2weeks is prob gonna be your best bet.
Happy growing
-ST
P.S. A few products I found that really made the hydro experience more enjoyable for me were House & Gardens Root Excelurator and Drip Clean, along with Great White by Plant Success. If you have the means I would highly recommend all three. 10/10, 8/10, & 9/10 --my ratings for all 3 respectively.