Every plant senescence is different. I’ve had several cultivars that just faded to light green and yellow. It’s easy to misjudge this as a deficiency especially when you see so many pictures of plants turning shades of pink, purple, red, orange and so on. I’d say ease up on watering and cut the calmag like as mentioned above

Oddly enough I just listened to a video from Harley Smith on propagation… and in it he address accelerating root growth. Apparently a foliar spray of 5 parts humic acid and 2 parts kelp extract with a little wetting agent causes exponential root growth. Can be used as a root drench as well. Thought it was worth sharing given the timing of… Read more

Would breaking up the root ball help at all? That might encourage them to spread out in the new space and maintain the proper moisture in the root zone, since it’s not a compact ball of roots and hard to moisten substrate.