Your experience with the floatplane and the VLJ from Just Flight is certainly intriguing. While not a universal issue in FSX, certain aircraft do behave differently, sometimes due to their configuration or specific design nuances. Let's delve into the possible reasons.
- Hardware Issues: It sounds like you've already considered your Saitek ST290 Pro joystick. Although you've recalibrated it, I recommend testing it in another game or simulation. This will determine if the issue is restricted to FSX or if it's a broader hardware concern.
- FSUIPC Calibration: If you have FSUIPC installed, this tool can sometimes override or conflict with the default FSX calibration. Ensure your settings in FSUIPC align with those in FSX.
- Aircraft Configurations: Some aircraft, especially third-party ones like from Just Flight, might come with their own set of control nuances. Checking the aircraft's .cfg file can sometimes shed light on any anomalies.
- Weather & Environmental Effects: Sometimes, crosswinds or environmental effects can make it seem like the aircraft is pulling in a particular direction. Ensure that these factors are neutralized while diagnosing.
- Flight Model Realism: Remember, FSX has various realism settings. Check under Options -> Settings -> Realism to see if adjusting these helps.
From my knowledge, such issues can also crop up in the latest sims like Microsoft Flight Simulator 2020 and X-Plane 12. The same diagnostics can often be applied, especially checking joystick calibration and software configurations.
Lastly, I must commend you on your taste - the VLJ from Just Flight is truly a gem in the FSX world! It's a pleasure to fly, despite the little quirks you've described.
Recommendation: Try flying with a different controller or even the keyboard to see if the issue persists. This will further isolate if it's a hardware-specific problem.
Hope this helps! Safe flying!