You have some very good eyes! Great job on taking note of details. I do the same thing. One thing I have learned over the years, just like humans, we all have imperfections. The plants you have displayed are vigorous, robust, plants. The tiny imperfections are normal and will continue to pop up here and there. The important thing to do is NOT PANIC! A lot of growers will see these tiny normal things and suggest its time for a change. That change will often times harm your plants more than help them. I try to look at the plats as a whole. Overall green, next to 0 imperfections, if your atmosphere is dialed in (nothing crazy, good light distance, RH, and Temps), I would recommend continuing on the path you're on :) Those autos should start flowering soon and more imperfections will come up. Its ok! This is a seasonal plant :)