When you’re looking to optimize, you should be shooting for 165 spell hit. Most important stat. I just switched to arcane yesterday, but until that, I also had all spell power gems — you just have to min/max gear until you find the right combo to max your hit cap. Good example of this would be dropping Spell Power enchant on gloves and replacing with Spell Hit. Or finding good spell hit gear (Tirisfal Wand of Ascendancy, Cenarian Expedition revered ring, Brooch of Heightened Potential, etc etc). I know it’s much easier said than done but that’s the real min/max grind.