The best suggestion that anyone can give you is to not do anything too complicated until you get the first one thru flowering. On top of that since you have done all the mistakes one could prior to flower, a simple question to ask yourself is "How many mistakes will i make in flowering and do i want to run the risk of killing my 4th plant being that i am now halfway thru the process?" Keeping mind that the more you do to the plant the more you will have to pay attention to it during flowering to ensure that you have a good product.... always remember for the first time K.I.S.S. (keep is stupid simple or keep it simple stupid). Basically it comes down to the risk you want to take of making a mistake and effecting your final harvest or potential for not having any at all. Just my opinion so take it for what its worth.