Spotted moby dick

5.5 run off is way too high also of nutrient companies include grow feed in the flowering stage . The run offf should be around 1.5 max so you need to flush everything out and study the nutrient guide so your adding whats required for the correct part of the plants life cycle. Good luck

its either a ph related lockout 5.5 is a little on the lowest end of the scale or you are simply over doing it with the feeds mate

They lack Potassium. Question is, why? Off pH range, Mere lack of Potassium, or Over abundance of Calcium. All of those will cause what you are experiencing. All you have to do is find out which it is. You know how you've been feeding. Are you using too much calmag? Are you not providing enough potassium in your feed, or is your pH out of wack in your soil? Raise that pH. 5.5 is too low. And testing the pH of runoff is a really bad way to check your soil pH. The pH is manipulated by passing through the soil so what you water in, won't be what comes out. Keep your water in pH around 6.2, and eventually your soil will level off to around that value. Bacteria in the soil can manipulate the soil pH as well, if you are using it.