Sour Diesel Auto- MSNL Seeds- First Grow

Week 3 had 1/3 plants showing a clear Cal-Mag deficiency. After flushing with 0 TDS, 6.0 pH water, I noticed the TDS/PPM of the run-off was FAR too high. The plant with the obvious deficiency showed over 4k TDS/PPM runoff, while the other 2/3 had close to 2k TDS/PPM run-off or lower. Plants were flushed until reaching 1,000 - 2,000 TDS/PPM runoff or lower. Now a few days into Week 4, plants are just beginning to let off a nice dank smell. The plant that was in the worst condition is seemingly still not perfect, but has made positive progress. The other two plants have been far better all around. There was minor signs of a Cal-Mag deficiency in one of them, however it was quickly tended to and is seemingly doing well. Note: 4-4-4 and 4-8-4 fertilizers were both added to the medium before germination. This is more than likely how I've come to encounter TDS/PPM issues with my run-off, considering none of these plants have ever received a feeding higher than 300 TDS/PPM. As a noob, I wasn't aware that adding these fertilizers to the medium (mostly coco coir) might be a bad idea, as opposed to using bottled nutrients. I believe this is where my TDS/PPM issues are stemming from and am not going to use any bottled nutrients for the rest of this grow.