Yeah, singularity rocks face.
I pretty much do the same stuff with Sentinel.
Warp first, then trigger the biotic explosion with throw. You really have to max out throw though to get the impact.
I think that works for Warp/charge, warp/pull, warp/shockwave. Stasis also rocks... i can't remember if its stasis/throw or stasis/warp that explodes.
With maxed out throw on sentinel i can pretty much take care of all basic units, guardians, pyros, hunters, marauders, and pretty much every Cerberus unit. I haven't really figured out tech combos yet though.
Sounds like i should play with your crew =P.
From what i've seen the non-human races are generally more difficult to play. (what with Turian's not having dodge, and drell having paper shields.) Haven't messed with Asari or Krogan yet.
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The People's Intern
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LOTRO: Windfola - Telpehta