if you are going to run it solo, a stormy is the way to go.
Just guard the portal with hurricane and fight the waves as they come to you.
It's football/soccer goal defense mission.
If you are on a team, I've seen some teams send out half to fight mobs and the other half stays and defends the portals.
I've seen some teams leave a couple at the portal and send three out each pathway to lure groups back to their side and fight them from along their choice of the two paths to protect.
It's really a team mission and not a solo mission.
But if they are too much for you and/or you just can't be as Uber as you want to be, sometimes we need to accept our shortcomings.