What about the linearity of the key? I think he is not linear.
And a few words about XORed key. I didn't find desired algorithm. My debugger is resisting - prevents int3 BP.
So there is 2 ways:
1) Create a copy swtor.exe and run in sleep mode.
2) Search for working debugger with original swtor.exe.
I'm trying the first way, let's see what happens.
What is with your progress?