Swiffy: if you're using A/G's nutes you have to remember that they're designed to keep the plants in a perpetual vegetative state for continuous harvest, not what we're doing. That's what got me away from their nutes. Changing at this late date might be a problem though. It would definitely shock your plants. Have you considered a shot of Monster Bloom? You can get it from most hydro stores and it will increase the potassium and phosphorus and encourage flowering. That's what I had to resort to when I used A/G's nutes. 1/8 of a teaspoon to a new batch of A/G nutes really helped. HSA