Overdrive works for you during the last third of your bloom phase, but you get tastier, higher quality crops if you stop all feedings 10 days before harvest.
For plants in their last 2-3 weeks of growth, the ingredients in Overdrive are more effective at increasing crop value than Big Bud, which is used earlier in the bloom cycle.
There ya go growmie, use for the last 2-3 weeks, then at the end just add another 10 days of only water or do a flush and its done.
Good luck and stay lit growmie.