Plants are in the 4th week since they showed the f...

Your two tallest plants look great try to turn them so the main colas are more toward the back corners of your tent tie them out of the way if you need to. Then allow the lower growth so it is under the areas with the highest intensity lighting. or move the lights slightly off center. You can also try to tuck or tie back some of the larger fan leaves to allow more light to the bud sites. Another technique is to remove the fan leaves from the lower 1/3 of the plant along with any tiny bud sites this will force the upper bud sites to get more nutrients needed to grow larger and denser. As for your runoff ph try to keep the ph between 5.8 and 6.5 for best nutrient absorption. My personal opinion is auto flower e.c. for week 8 should be in the 1.7 e.c range with your runoff after feeding. 2.1 e.c. run off is kind of pushing it so I would use plain water until it drops to the e.c. to a point when you can feed her again. Just keep an eye out for yellow or brown tips on the leaves a sign of nutrient burn. One plant may be able to handle more than others. Your bubble gum plant is feeding heavy she wants more nutrients give her a couple of feedings in a row to get the runoff e.c. higher then switch back to a feed then water routine. You also need to make sure your not over watering them. Especially your auto white berry II . Lift the pots to feel the weight difference between waterings you should be using a strict wet then dry watering cycle. In other words let them dry out a bit more than usual between waterings. You have small plants in big pots the upper part is probably drying faster and the lower part may be too wet. As far as nutrients go they can be very opinionated for bloom low nitrogen-med/high phosphorus-high potassium 4-8-8 or 4-8-12 would work well. Buds will pack on the most weigh during the last few weeks of bloom you have plenty of time. It's also a good idea to add a good calcium/magnesium product because buds use a lot of it while growing just watch out sometimes it has additional nitrogen to don't forget to account for that. A good natural source of cal/mag is unsulphured organic black strap molasses from a health food store it has some other goodies that your plants should love. Start with 1 teaspoon molasses per gallon water once per week then increase to one tablespoon per gallon over a couple of weeks. Check the ph and adjust as needed it tend to run on the acidic side. I hope this helps you out I will follow along.👍