I think you are spot on with the blood meal because I hit a N deficiency extremely fast in transition that I roped in with compost teas using fish fertilizer, bat guano, and worm castings.
My mistake there was reading into his technique of top feeding for flower when in actuality DTE recommends to feed on a month by month basis. Now, I have some wedding cake in some standard soil with DTE. Been feeding it monthly with absolutely nothing else and no issues. Pics of it is in the see your buds now section (idk how to share that here).
My big take away is, if you’re going to use DTE with coco for autos we need to master the plants ability to uptake nutes early only on, so…mixing it with the coco and doing a top dress application in seedling stage is probably wise cuz we dont have time to play. A more wiser approach would be to use photoperiods instead of autos and its here I think you can begin to tweak, master, then move to coco. You’ve got me contemplating on a few beans I just popped. I might run two like this n see.