I wish I had a third auto growing. I’d top the big one a second time. I think if I believe there is two weeks or more left in the veg stage it will be more beneficial than not. You lose a week to the plant re-grouping after a topping, but then you are getting a week of twice the growth, which essentially would make up for that lost week.
Topping is probably a bad idea for autos. The topped one is much further along, but that spread on the un-topped one that’s a couple weeks behind shows the real story. Left plant in pic with both is untopped.
Here’s a small sample bud from that topless auto. It’s the best weed I’ve ever smoked after only 1.5 hours of dehydrating. Now to chop it and properly cure it.
I’m starting to think that topping may actually still increase your yields. All of the colas on the topped plant are medium-sized. The un-topped one has one main cola that’s huge, but the rest of them are smaller than those on the topped plant.