Don't get d9iscouraged, Micro, we'll get this, it'll likely be something simple, usually is. I assume you've checked your config for the easy stuff like typos in names, passkeys etc? OK, then before doing anything more advanced, let's get a benchmark for what you're currently experiencing from what: what are your ppd for all three cards on two current but differing series, 800x and 8019/20? In ppd on 8019 I nail 16000-17000 on my 465's and 12000-13000 on the 550ti. It's about a grand less on the 800x series.
Use Precision or Afterburner to make the same determinations for %GPU usage. Answer or a clue might be right there. And if you watch Core_15 in Task Manager does it take a percent or two for an instant at least every once in a while?
Try adding the flag -forcegpu nvidia_fermi .
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