I’ve read both those books. Really enjoyed them.
I do agree that Quantum limitless targets the 400 and that alchemist is 500 but disagree that Dragon Reborn targets just below 200.
A lot of 200 level people could benefit more from dragon reborn compared to other subs but they might go for something else instead because they feel like it’s not as important to focus on healing.
I also remember Dodson saying that people have “pockets” of different energy levels so even if someone is a level 400 they might still have some pockets of 200-300 level energy that can be released through a sub like Dragon Reborn.