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Do one file at a time. Hopefully it isn't the last file ;)
Yes I am not shying away from the pain of it.

All I am asking is does anyone feel familiar with the crash and why it doesnt leave a log? Seems very specific to me.

Also, it seems it keeps happening regardless of any specific file or nation, as soon as you mod a few completely different ones it causes the same manner of crash between march 1937 and may 1940.

By deduction There is some logic behind it that is not bound to any specific file.
 
I can't think of anything based on only this limited information.

Have you activated debug to level 1 or is it only at level 0?

In history.txt, is there always the same event as last one recorded before a crash?
If it is the same, is it one of events modified by you? In that case you should post it here.
In general, if you have suspicions about certain events, you can post them here for validation. But honestly, without access to your mod, it's difficult to find the issue.