Hello there! Glad you liked the guide ^^
Now for your question, I really like the way fire/water works and how your build looks like. Only one thing that I can spot right now and that is, why not use tofu or clawbot instead of scarafly? Also I'd maybe change the electoocute for something like a tort soul or even whispery ring or anything similar with CH% and hp. But its just a minor difference between them, just a personal preference.
PS: Also if you need any more help, could you please tell me more detailed about how you use your build so I have a better idea about fire/water element damage sacrifice and such statistics.
Hope this helped x)