Thank you hope this gets settled because it truly is a beautiful Scenery
Blue screens can't be caused by a normal software product that has no access whatsoever to the ring0 execution mode.
The ONLY software that can do this, it's a driver, either video or storage. In your case, is very likely video. However, the Blue Screen should list which driver (something that ends with *.SYS) caused the issue, together with other infos about locations, error code, etc.
You are probably assuming that JFK is causing the issue "just" because it seems to go away if you uninstall it.
The problem is, you are not making the test correctly because you are installing JFK AFTER all your other addons.
So, if the combination of the *other* addons put your system in a condition that is CLOSE to memory exhaustion or it's CLOSE to a situation of makeing the video driver behave badly and causing the BSOD, it's enough installing JFK to cross the boundary between being able to run FSX without the video driver exhibiting its bug, or not. You might have installed any other complex scenery, and it would probably happened as well.
So, a better test would be, instead, uninstalling all your addons and then trying JFK ALONE, and see if the problem reappears.