Certain plants love to be stressed toward the end of life. Ripen by GH is one that I've used myself. I'm itchin to do some experiments at the end of summer on some of the bigger Naga bushes that I have. We will see if the stress induced by a strong nutrient solution will give rise to more heat. I'll have a good line of peppers from the same plant over the coarse of the summer to compare with the end/Ripen stress. My EC sits at 2.0 to 2.6 during the crop cycle for the Chocolate Habaneros, and pH at 5,8 gives the strongest flowering, but I try to keep it at the recommended 6,3 pH that was taught in school. The plants prefer 5,8 though. If the light is too weak, pH will fall (wildly and quick), and if the light is too stong pH will rise (wildly and quick). Water here is almost a perfect 7 (7,3) in winter, and 8,5 in summer but ppm is 40, and EC is 0. Lucky as hell to have the best water on earth right out of the tap, with no chemistry added. I use PH down in low low low doses to maintain 6,3, and the flowering peppers in NFT just drive the Ph down to 5,8 and stays there.
Interesting. Peppers don't react the same as some of those 'other' plants in NFT that's for sure.