Looking GOOD folks! | Week 5 Flower | CGS QU3

Just started week 5 a day or so ago. Keeping things going. Started to see some burnt tips which I believe is symptomatic of nutrient toxicity. Since I had not fed the plants until 4-5 weeks after planting, just about at the beginning of flowering, I am thinking that the soil still had more nutrients than I thought so by feeding them, it was too much. I'm still learning how to feed properly. I used to feed from the beginning but found even just feeding Big Bloom led to burn tips. I've been feeding at about 1/2 the recommendations and think next time I might even knock it down to 1/4 once I do start feeding. My water does already have some dissolved solids so it's easy to get too high on the PPMs quickly.