Fairy Cake Auto - Mephisto Genetics

Hello my friend, I can see some problems here and the first thing you want to do is stop feeding and let the top layer of the soil dry out completely in between waterings. The roots lack oxygen and when you continue this behaviour then your plant will stay this small. The soil got enough nutrients for another 2 weeks without a doubt. You just want to water with pH 6 for this phase.

Not enough light and you shouldn't give that few Grow nutrients from the tri-part you use. In veg, plants needs nitrogen, and and it's mainly the Grow part that supplies this nutrient.

This is just a overall sign of poor health. Autoflowerz sucks doesn't know shit about autos. They are really for more experienced growers since there is no way to control the growth. Big autos come from dwc, or coco/perlite grows if you know how to maintain the coco right.