Yea I though it was your last flush. so adding nutes at that time is good. As for flushing I just use plenty of water on any flush.The way I water is that I kind of flush on every watering. by that I mean that I water or feed till I have runoff of 1/4 to 1/2 of what I put in yea it is a lot of work but I think doing that helps with salt buildup.also scratch dirt on top of the pots to help break up surface tension and let my whole planter get wet .I also use a wetting agent SM-90. I'd keep adding molasses even after you stop the nute's at the end just a little 1 tablespoon per gallon. If you are using RO water then you better be Adding cal mag to your water I think I have said that I use tap water that I let sit in buckets that I put air stones in for a day or two that way I don't have to add cal mag.