[ 3.0 ] Help me improve my Arc Selfcast Summoner hybrid?

Hi Guys!

So I thought it was a good idea to make a self-cast Arc and Summoner hybrid. I got pretty much all minion nodes and a decent number of lightning nodes. I do decent lightning damage, but my minions are kind of meh. Zombies survive well enough, but don't do enough damage. And skeletons just die off like flies. I'd like to make the minion part of the build stronger. So I was wondering if there are some improvements I could do, that I overlooked?

Thanks for any suggestions!

Here my equipment and gem set up (the two socketed passive nodes are Dead Reckonings):


Here my passive tree and ascendancy: