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Another non-RX8 guy butting in. I have to agree with Fendamonkey on this one from what I have heard discussed by the RX8 guys. If your coils are the originals then they are the likely culprit. Coils are one of the big weaknesses on the RX8s and from what I have heard 85k is about where they start acting up. By all means change the plugs if you are unsure what condition they are in. You will have to de-flood the engine to get it restarted. Pull the plugs, disconnect power to the electric fuel pumps, and crank it for a bit to dry things out. Fuel pumps and filters are a possible failure point if the engine is not flooded. You would have to check what kind of fuel pressure is getting to the engine. Most shops that deal with EFI should be able to handle that for you.
You have to have a rotary specific compression tester to get any kind of a meaningful reading for engine compression. Not that it can't happen, but it is over diagnosed on rotaries. Other than the screwy compression tester there isn't really anything all that different about diagnosing a rotary versus a piston engine.
In your case injecting a little distilled water or Seafoam every now and then will help the carbon buildup once the car is started and warmed up. The automatic cars are prone to carbon buildup for the reason you stated.
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