More nutes doesn't necessarily equate to more buds. And the later on in flower the less nutes they want. My plants are going on Day 55 and only wants 300-350ppm (.6 to .7EC for my 500 scale meter)
The plant is drinking more water than nutes.
DWC requires very little nutrients. I burn most plants that get over 600ppm in flower.
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This plant maxed out around 550ppm for me in flower. Got burn when I tried to go higher. That top cola was around 2 ounces dried.