I have used the Lucas formula before in a Wilma system and soil with good results, I would personally prefer to use the grow micro and bloom just so I can cater the npk exactly to my liking but many use Lucas formula with good success. Given a choice I like using a two part grow and bloom like canna or house and garden only reason being it’s simple and I am in my comfort zone as it is my preferred method in hydro or coco. Happy growing buddy👍