Honestly, I recommend topping. Your biggest plant is probably ready. It's such a quick, simple snip and you'll exponentially increase your colas. I'm in the midst of my third harvest and have topped almost all of my plants...one of my biggest regrets from my first auto grow - I didn't top two of my four plants. Today, I'm slogging through the drudgery of harvest - trimming, hanging, prepping my rim/larf buds for hash and hash oil, etc. I have three plants in 3 gallon fabric (smart) pots. With your 5 gallon pots, big tent, fans and light, you could be poised for a significantly larger harvest than I got this time. I also recommend not stressing too much. It seems you have a great set up - WELCOME AND ENJOY THE RIDE!!!