At level 21 on my Dev, WT 8, I have settled for now on a mix of skills that includes Earthquake, Golem, and Gravity Leap or whatever it’s called. Mods give me armor, extended range, and an extra use for Earthquake, longer duration and refresh on kill for Golem, and healing with the leap. Using an autorifle with the Bone Shard mod (blows stuff up on kill and maims folks around it) and a shottie with either freeze (for a mod that gives me more damage to frozen) or a high-damage breach shottie with the Lightning Whip mod (for extra damae), I can generally cycle through my stuff and have either Golem or the healing leap up before I get too dead. But it can be dicey.
I do like it though, all in all.