Might want to mention you were getting tricks of the trade as well. The only thing I saw that seemed wrong was the usage of your second potion. I always save my second potion for molten fury range and my last combustion. I think the last time I did LFR Ultraxion with no di/fm/tricks/flask/food I did 45k, and I have pretty similar gear to you. I'm sure it's all dependent on how good of RNG you get though tbh.