First mistake was transplanting a nute burned root bound plant into hot soil.What soil was you using before?And are you watering every 5 days really or does it just so happen to dry out every 5 days? Me personally would flush and and don't even think about watering until the pot is light and soil is almost completely dry,sometimes flushing while it has wet soil already will cause over watering drooping but i'd rather have a few droopy leaves for a week than dying nute burn leaves that seem to be spreading.