Imo the addersgall replenishing early makes me use Kerachole earlier than the rest of my toolkit. If I need more mitigation, I'd use Holos or rotate after Kerachole expires with Taurochole. I actually like that aspect about Sages the most.
Normally for Scholars, they'd use Recitation + Excog, or just throw up an Excog if they're saving Excog for Indom since Aetherflow runs on a different resource generation timer.
For Sage, I'm currently using Kerachole first, to both slow damage and to keep addersgall regenerating within the next 20 seconds. Then if I need to use 2-3 addersgall for quick burst healing succession, I can immediately pop Rizomata afterwards. The order of Sage's toolkit works slightly different and I like that because it keeps a very steady and rhythmic healing pace going.