New Grower When to start using Overdrive from Advanced Nutrients (or comparable final-stage bloom booster)?

[BII]

With autoflowering plants, when is it best to stop using Big Bud (or equivalent) and add Overdrive (or equivalent)? What signs should the leaves, trichomes, etc. be showing to signal that Overdrive should be started?

Or as shown by the Advanced Nutrients feeding calculator, Overdrive should be started 2 weeks before any flush (or halt in feeding) phase is started? But how does one determine when there are 2 weeks left to go?

In the context of autos, I presume Overdrive should be started after one sees plants showing obvious old age decline, such as fluids/nutrients very being systematically sucked out of leaves/yellowing. Or is it better to go by trichomes, such as start Overdrive when a certain portion go milky or even brown?

 

[faded187]

Depends bro. These xxls I'm doin now are more like super autos. But on a normal 80 day plant I start using round day 60-65. Prolly use round day 70-75 on my moby dick xxl.hope that helps friend

 

[aperson]

After I start the feed for flowering, I give Big Bud the first 2 weeks and after switch for Overdrive.
They say on AN website to start Overdrive at week 2.