transfering safe at 20 days into bloom?

TBH, that really pushing the limits. I think most people would say dont do it. But my advice would be do it if you think its absolutely necessary. Just be REALLY careful not to disturbe the rootball. When my pots dry out the medium shrinks away from the pot a little allowing for easy removal...cafefully lift it out, place it in your new pot, and fill around it. If youre a bit rough you'll just set youself back a week or so.
 
If you are just switching to flower by all means transplant if you need to. I would rather shock them a bit now and have them in good soil mix than hate myself all during flower saying, they aren't happy and I won't get the yield I should be. I do differ in my opinion with Ganga, I always score my rootball to get it moving towards the new soil more readily, just my two cents though. Good luck, oh by the way if you are newer to growing things and tranplanting allow the soil to dry a little before transplanting. This will allow the rootball and soil to slide out of the container easier.
 
It would probably effect you're yield that far into harvesting! Why risk it just to add some perlite? Perlite makes the most difference in veg and early flower anyways
 
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