Okay I found a workaround to this since I too have latency issues. First I use fist of wind and set Enemy Cast UI Bar right in smack of the middle of the screen. I focus ONLY at the castbar, screw everything else it'll distract me for a rich amount of 0.1 second. Once I see a yellow pixel I FKING QUICKLY RUN THE FUCK AWAY I'll see that boss is still 50% done casting then I pray that my dodge was successful but this works 75% of the time.