I will say that you should have Frenzied Regeneration outside macro with that talent you said ( Guardian of Elune - Spell - 11.0.0 Beta )
That is likely the better aproach, to have mangle also aswell.
Check in due time some aura on wago.io ( or make yourself one ), and youll have better control on it.
Cheers.
PS: ill mostly update ( if ) only till expansion launches, later on i dont think i will ( i do this with every xpac )