If you suspect Nute burn, it probably is...the soil you describe has ALOT of N stuff in it....simply back off the nutes! Oh yea....cant do that if there already in there, now can you? Flush! Try flushing with pure properly ph'd water...maybe 3 times pot size and try a not quite so hot soil next time. The problem with hot soils (hot meaning loaded with nutes) is once it's done, it's done and there is little you can do to control the feeding. I'm a less is more kinda grower, so I would rather starve them for nutes a little and read the plants to see what they lack and add it accordingly. If there is too much already in the soil, you've got l;ittle choice but to physically remove as much as you can by diluting the soil. I know, cuz I use a hot soil,and dilute it with pure topsoil, perlite and other substances. I would try flushing well, let drain and dry somewhat and repot in something a little (alot!) cooler. They will recover if you can get the soil back under control. You are not checking PH at all and that can make the problem even worse! Go to Home DePOT or Slowes to get a 10 dollar PH meter...not the most sensitive device, but it beats guessing. And CHECK it EVERYTIME you use water! I use the moisture/light/PH unit seen in Jorge's grow bible and it's all I need. I ck soil ph, water ph and runoff ph everytime I add something to the pot. Hope this helps and good luck!