Pineapple Auto- (first ever grow)

Bestva sun light- was watering and feeding every other, haven't had any apparent nutrient issues so far but the buds are not growing. I thought there may have been an issue with the nutrients of the plant without showing any signs due to the lack of growth so I flushed it, which then started showing signs of nitrogen toxicity. Wondering if it was from stuff left in the soil or not. 18" tall- light is abt 1. The kolas haven't really swollen up at all in about a week or two. (both these plants are the same strain and soil and nutes use) Vivosun- Budding fat but running into nutrient issues. Shown, what I thought was, calcium deficiency, but then I flushed the plant and then it started showing Nitro toxicity. Thinking that is from the OFFF as well but unsure. Apparently it may actually be potassium deficiency instead of cal-mag from the spots. Flushed this one as well to try to address the nitro toxicity. Shits going to hell and a hand bag right now lol. If you happen to read this and have any suggestions to get this back on track please let me know.