I thought JJ was a 2 part. I use the 3-part base nutes and feed all 3 in equal amounts for the stretch then drop the Grow and use the Micro and Bloom in the Lucas style with twice as much Bloom as Micro to lower the amount of N in later flowering.
I'm also giving half dose of Big Bud a week before flipping and use a small amount of Rhino Skin, (silica), starting when the plants are small as I grow in soilless media, (ProMix HP) or DWC. A little CalMag each watering as I use RO water and some extra Epsom salts now and then with a decent dose after the stretch for some extra Mg and S.