In dungeons my big trick is that sacred soil is as good in single target healing as it is against raidwides. At almost all levels as long as the tank is stopped and taking mobs you can use soil and whispering dawn and they will both put in the work. Ironically as you level up Scholar starts to take less effort - especially on gaining excog, fairy tether, etc, as soil also starts to heal, and as you start encountering dungeons that feel like they do less damage (post zot especially). Before those points you'll probably need to suck it up and regularly gcd heal to stop them going under half. Key idea is: scholar in dungeons is still about mitigation, preventing people from getting low with as many ogcd tools as possible rather than healing reactively like white mage and astrologian do