overdrive is liquid and i 1-5-4 AN recommends wks. 1-2 bud blood, 3-7 big bud, and 8-9 overdrive.. this is for ten week strains which is damn near everything I run regardless of the strain I always like to push to 10 weeks.. and the big bud powder I have is 1-17-38..
Here is what the advancedepedia says about using overdrive instead of big bud in the last trimester..
Q. I use your Big Bud with Connoisseur and get fantastic results. So why is Overdrive also very useful for me?
Big Bud is indeed a top-producing bloom booster and Connoisseur is a premium bloom base nutrients formula. But Overdrive still gives you even more. Our studies find that bloom phase has sub-phases during which very specific types and ratios of ingredients are required. 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 bloom cycle.
I already bought the overdrive so I might as well give it a try.