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I can't diagnose this system from across the country but I agree with turbo6bar, in that your current problem is most likely not due to the design.
However, depending upon where your thermostat is located, and given a higher than normal supply air temperature, it might be possible that the compressor may run a long time. I'd suggest having a mechanical engineer (as opposed to a contractor) take a look at how your system is installed, to see if there might be a better way to do it. I have installed a bunch of systems in server rooms and telephone switches and we never use outside air, primarily as we are also needing to control the humidity within a narrrow range.
JR
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