From your report, it's seems all your problems are caused by AI airplanes.
WoAI has many models originally made for FS9, and these are known to cause crashes and poor performances in P3D4.
The reason why you didn't see any crashes without FSDT KLAX installed, is because the default KLAX has way less parking spots with different (not really "different", it doesn't use any airline codes), while KLAX has way more parking spots and it does use proper parking codes so, the AI going there would be very different.
In addition to that, AI originally made for FS9, are known to cause rendering problems in P3D4: not only they disappear in combination with complex airports, but they can cause visual issues to the scenery itself, which explains why your SODE jetways and other GSX vehicles disappeared.
I suggest stop using such outdated addons in P3D4, and use an AI traffic package officially compatible with it, like UT Live for example. This is what we usually test our products with.