That's my pattern with the Titans. Hit them with 4-5 cluster grenades, recharge, repeat if needed, open up the vulnerability, 2-3 more grenades. Done. For me they are a lot easier to deal with than Ravagers or Hive Lords since they don't underground vanish on me all the time. I hate those ugly things.
"The early bird may get the worm, but it's the second mouse that gets the cheese." (PSN: Dragonivon , XBox: Dragonivon)