While I have not mustered up the nerve to cut into the plants like this, I have read a lot about success with topping and fimming autos. I think having ALL your environments in check to minimize stress and allow quick recovery is key.
Check out posts by a few who have really good success:
@Not2SureYet @kellydans @Nicky Maybe they can provide some details and insights. You can also do a search for other posts related to topping and fimming.
I am on grow number two. I am definitely going to try these techniques after I can get a better grow space. A little 2x2 closet is hard to control environmental factors.
I think the best is to try and learn from each grow.
Best of luck.