I had really good results with Overdrive. You'll want to use it for the last couple weeks of nutes that you give your girls before the final flush. It's a flower 'finishing' PK nute booster. I used AN for quite a while many years ago and I did some A/B tests with and without OD and the plants fed OD in the last couple weeks were bulkier and thus heavier... I also had great results adding to other nute regimes although I didn't use it back when I was using the GH nutes when I grew in hydro.
The one thing I would say when using AN products as a stand alone, still use the rate suggested by the AN Nute Calc...
I always used it at the rate the Nute Calc suggests: 10ml/Gal (2 teaspoons) and add it to your other nutes for for weeks 6 & 7 if you have an 8 week strain and then flush for the final week. I found the rates printed on the bottles were much different and always too strong when I followed the rate on the bottle and I had great success with the 2 tsp rate.
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