I normally quit using ferts two weeks before I am going to harvest. I don't believe in what people normally call flushing. Just use plain water. While those massive amounts of water flush the chemicals out the lack of nutrients creates a deficiency, forcing the plant to use up its internal nutrient compounds.

I am incorporating molasses into watering scedule but in 4th week of flower and keep it up right thru the end.

Instead of plain water thru the last two weeks (instead of flushing) it will be the molassess/water combo. Will be interesting to see the results.