Looks like you got the nutrition and environment down pat, but imo you need to start to do some Low Stress Training around week 2 or 3 of veg next run. All that stretch could be horizontal giving you MAD colas. Learning experience though bro, like each grow is, at least youll get a decent amount of bud to smoke while you grow some more lol.Nice grow I have the same issue, my BubbleBOMB strain stretched to 7f, I bent them sideways a bit but I was afraid of snapping them so I immediately ran out and purchased a Gorilla Grow tent that comes with a 1 ft extension and switched tents as quick as possible, problem solved. However, this is my 3rd Grow and I quickly learned that growing pot is not without problems, there's always something! For example, two days ago one of my clip on fans unclipped on it's own and fell onto one of my plants, heartbreaking! I'm so upset! So I removed my other clip on fan and laid them both on the floor for circulation, sucks, but after this Grow I will reconfigure my setup so it'll never happen again, live n learn! Here are some pics of my 4x4 tent with three 7 gallon pots
A simple topping between 5th and 6th node, then some LST to bring out the new branches even with the tops, then drop a scrog net in there a week or 2 before flipping to flower. At least thats my recipe and it seems to work pretty darn good! Now that you have that Gorilla tent, you can rest assured that, together with LST and scrog, you will never have any height issues ever again.