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.