Missing helm from gnomer and 7/7 gloves, only would recommend the sp extreme goggles for offensive disc priest (if you're a healer, you fucking hate the spirit nerf, so balance your regen along with other stats and the helm from gnomer is a good start. Plus it's a great finisher if you're offensive.)
Do you use decursive in conjunction with the dispel glyph? if not you should, you're one of the 29 brackets most important tools: the dispel
That's also why I would aim for maybe at the very least 2.3k mana
Why so much spell power? around 135 is enough to get 400 flash heals not crit, it's just my opinion you should aim for the very least 1400 hp unbuffed and balance your mana pool
My highest heal has been 1525 unbuffed, and I'm pretty sure that was in regen set but I'm more of an offensive disc priest, I murk 2k hp druids with nade+fear+dispel+dot.
4/5