I would highly recommend experimenting with lower PPMs (ppms using the 500 scale are just 1/2 of EC, so 1 EC would be 500 ppms, 1.2 ec = 600 ppms, etc) all the way through-if you feed coco multiple times daily, you can get away with quite a low EC, because you constantly replenish the nutrients the plant consumes with fresh feed. That's the beauty of coco. Personally, I'd rather grow in soil if I wasn't committed to feeding at least twice per day in coco. Ideally, I'd set up an automated system and experiment with feeding more than twice per day, but it's not necessary to get good results. Next time you grow in coco, see how your plants respond to 1.2 ec (600 ppms on the 500 scale) all the way through flower. This is a great article on the chemistry behind coco that will give you some good info on why we can feed it this way:
https://www.icmag.com/forum/marijuana-growing/growing-in-coco-coir/308425-the-chemistry-behind-coco-coir-a-strange-journey-from-ferts-bottle-to-to-buds?t=307683. I'm getting good results in my current soil grow, but I miss the versatility of coco, and how you can instantly fix any nutrient deficiency or ph issue, so I'm going back to coco next month. It's good to listen to these different viewpoints, there are many roads to success with any media, and Xtsho and Tint are both awesome growers.