Hello Colvale,
thank you for replicating the flight TISX-TNCM. I'm not sure either that this is a scenery issue - I'm even not sure what kind of issue that is. That's because I was reaching out to the community, because I felt helpless about it.
From reading the forum I got some hints I want to follow up next: the joystick axis issue with mixture leaning which might be the cause and maybe the Carenado planes - but here I don't have the feature to use virtual flights with others.
I will first look at my Saitek X52 settings and let you (all) know about the testing.
Thanks for your participation and support,
bz