looking at your main stem mazmen, it's twice as thick as mine. Though my problems most likely occured due to stretching, I'm on my way towards fixing the Ph levels. It's about 6.2 right now and just started today (2nd week) with adding water with higher Ph (added a tbls of baking soda in a gallon jug, modestly watering when they need it and testing Ph (which is now 8.5) before adding it) to the plants. It's too soon to test run off as I just watered, but as soon as I do I'll post the results. I hope the neutral ph level will lead the plants to strengthen up and get that stem to a better size. The light problems was only a minor set back, I have no intentions of quitting and if I need to spend an extra week or two on veg I unfortunately will find the patients somewhere.