I searched the forums for info on this this and didn’t find much. For my build, i spam whirlwind and run out of mana/resource. I have changed some things to help sustain my resource, but that merely slows the end result. My questions are:
P.S. I cant login to the forums on my phone. Is that normal or do I have a problem with the phone?
save your affix slots. craft an energy mythic. problem solved. one affix.
as for loggin in, thats odd. perhaps ask @tdaniel in support?
I dont think you looked very far 
i recently posted a build using whirlwind… i use alchemy which offers no help to sustain, my HP and MP are 9’300 each mainly clear cast 50%, 25% resource cost and a small amount of regen…
Picking up orbs usually keeps me full enough
Just add two clear cast mythstones (clarity) more attacks, better sustain and with haunting ring (from rogue) you gain double damage from its bonus 
if you use discordance, your whirlwind will use primary mana cost instead of special.
right now I am using equivalence and harmony with 2x epic hp on hit to spam my twister. even with maxed cool down, my hp/mp hardly goes down, usually only when I meet some mean monster using thorns. 4 slots, but I wonder if one will do, or hope for a crystal hp on hit, then only 3 spaces.
You can use Energy Mythic or MP on Hit.
Looks like energy solved my dilemma nicely. That for the advice guys. Ima try a few more things to get some survivability on my build.
Also phone dilemma was solved as well. Just needed to allow cookies.
good stuff
