You may want to keep in mind that your divine lightning powers put you a step above mortals. 
The game’s difficulty has been meticulously tuned over years and we are very happy with where it is overall, including the aforementioned bosses.
You are welcome to adjust the difficulty through modding to suit your tastes for yourself and like-minded individuals, or you can try the Shattered Realm in the next expansion as its difficulty ramps up far beyond what the Crucible offers.