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I'm not with Laminar Research, just a fellow simmer in the UK, but have you properly configured your throttle flight controls within X-Plane 11's joystick settings page, as per the photo below?
I'm not sure what aircraft you are flying or which flight control set you are using, but you may also have to select the 'reverse axis' check box to get the mixture to work correctly?
PS Under no circumstances should you be using any third party software to configure your flight control system, as it all can be done within X-Plane 11's settings pages!
I sometimes swap between my Thrustmaster joystick and my Logitech yoke setup and this has never caused me a problem before!
Anyway, all of the original discussion about flight controls began simply because I thought your problem was related to the mixture control, such as that you would find in a GA aircraft such as a Cessna or Beechcraft Baron.
However, it now appears that the problem is not being able to spool up the engines in a Zibo 737 and similar airliners.
Before we go any further, please confirm that my assumption is correct?
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