Here are the logs from heroic highmaul where I tried arcane. From the looks of them it seems like I did not cast arcane blast enough and possibly did not cast arcane missiles enough. I also noticed that I only casted evocation once, this is because after getting to 50% mana during my burn phase i finished my rotation of missiles before doing evocation and I found that I was quite close to 80-85% so I did not cast evocation was this the wrong approach? Should I have done arcane blast to 50% then just used evocation? I will also be switching nether tempest to supernova because I think it goes much best with crystal.
https://www.warcraftlogs.com/reports/LHtgWvzqPA4NVbTj