DJones,

Calibration is not required to use or diagnose the speakers. BUT... Calibration is a great tool to help you REMOTELY diagnose the problem without being there. It gets us all on the same page. If you are not using the G91a then you are probably at 0 offset. I'm sure after the upgrade the speakers were factory reset. Given that, they should play at 85 all day long. BUT that depends on the source (the actually music you are playing and CD vs DVD-A is DIFFERENT). Blueman group CD at 85 might get the amps hot after a while. But some light classical will play at 95 all day long and the amps would probably be cool.

We don't have enough info to diagnose the problem.

We don't know if your power is ok (which is a good call just raised).
We don't know if the environment is too hot or close.
We don't know (yet) if the speaker is good.
We don't know what you expect from them.

The D6000 is not a PA or Cerwin Vega, but it's a pretty potent great speaker. I think is still holds SteroPhiles record as the longest running class AAA speaker.

I think waiting for feedback from Atlanta to get a baseline on if the speaker is ok is your best first step.

- Fiddler (IMHO)

If you think listening to music is fun, try learning an instrument.
HT: G61RSL, 4x5K, 5.5KHC, 2xSC6000, Transporter, HD621, Philips BDP7501 4K, Tivo, 65" LG OLED 4K C6
Computer: Foobar2000, 5K, Mojo, HiFiMan HE1000 V2