In Patch 2.2, the developers made the decision to put accuracy on raid-level healer gear. To whoever is responsible for this change: THANK YOU SO MUCH. The accuracy cap for T9 for mages was ~470 and the max possible accuracy for healers in non-melded gear was 424 (404 without food). This was acceptable; there'd be the annoying miss every now and then and Scholars could always put Bio, Bio II, and Shadow Flare without fear of missing and gamble the MP on Miasma and Aero for extra damage.
I didn't find the right solution from the Internet.