If you're still having trouble, I highly recommend switching out angelina+mousse for vanguard + 2nd defender. Also remember that healing defenders typically have lower def/stats than pure defenders and cannot block 3 until elite 1.
Also consider using more 3-4star units because their early game stats are better than 6star units (who typically only shine after a lot of investment and elite 2) and cost a lot less to put on the map, which allows you to get your full team on the map much earlier.
Also remember you can retreat units and replace (for example when crownslayer jumps behind your defense), you can have 1-2 dps units on backup and aim where she is.