Now that your feeding is bumped up now, to what everyday or close to it, you shouldn't have that probably. That's why for coco you need to keep your container small to where you at least water everyday. Your goal is to treat it like hydro, not to let it dry out and salts build up and to replace nutes and oxygen as much as possible. I went smaller than you and I think I should have went smaller but I think I'm ok for flower. My goal to water 3 times a day. Two of them are up to twice a day. If you don't or can't water that often. I would maybe think about keeping a eye on a regular flush schedule or just monitor the run off but you cant go by that a 100%.