Mephisto - Double Grape & Grape Walker Kush

Start of week 8 for DG. Buds are still filling out. Wondering when of if I should flush her before harvest? Only been using Cronk Nutrients for a couple of weeks so I don’t think there should be too much of salt build up. Haven’t tested and ppm from runoff. She still showing a little bit of bite or light burn so I fed her plain ph’d water for 2 feeds in a row so we’ll see. The GWK is starting week 7. She’s taller but still has a lot of filling out to do. She also showed a few leaves of nute burn but I’m pushing her. She had one plain water feeding this past week. She’s looks great though. Flush or no flush? I think I’m a couple weeks out from DG harvest.