@Kendoda, Your temperature gaps are generally pretty tight, Between lights on and lights off. As you approach flower & into the first few weeks of flower that gap opens up more 9 degrees on the thermostat, Could be 10 degrees or more in reality. Up until week 3 of flower, Generally day 21 the plant is still growing & environmental stresses in the form of large temperature swings between lights on and lights off, Simulate the approaching end of the season in the plants genetic code they react to this by stretching to try and hurry up and finish their first goal of growing up tall and wide before forming flower.
So that is one promoter of un-wanted stress I see in the diary. For 100W LED you are going to want them closer than 18 inches, Do you have a PAR meter or a thermal temp laser gun to monitor plant top temps ? I would say lower PAR than what the plants require to give them the proper DLI ( Daily light integral ) which causes the plants to chase up after the PAR, Combined with the wider temperature gaps right when the plant is beginning its early flower stretch are the 2 contributors to your stretch here & are easily fixable :)
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