Help

My Puple Kush have been under 2 1000 hortilux hps for three weeks now in large rock wool cubes during veg. Lights are about 36 to 40 inches above the girls. My plants all look very similar, the old fan leaves were yellowing and had necrotic spots, i believe that i corrected that problem too agressively and now my leaves are dark green and are curling and spiraling. Bunches of growth in the middle of the plant and no stretching. Fan leaves are not large and they only have the 3 middle fingers thriving while the other two on the ends look very very thim and week. On Some of the tops of my plant has new leaf growth but some are spiraling into itself. Im using half the recomended dosage of nutes on an flood and drain system. 1 ten inch exaust, a regular intake fan set in a box in the window and several circulating fans. Temp stays at 67-80 degreesF. with my RH of 45-55% PH water at 6.0-6.5, small boy water filter. MY concern with the growth in the middle is that maybe my cuts had been taken off a flowering plant before i got them. Please any advise will HELP!!!!

Pure pro Grow Botanicare
Super thrive alive b1 red
Cal Mag Botanicare
Diamond nectar general hydro
Vegan compost tea General hydro