Originally Posted by JDR13 
And the fact that everything gets zoomed out and smaller with TuTu.
I'll repeat. TuTu != any set resolution. You CHOOSE your resolution with the WS mod.
So, with TuTu + WS - you can get EXACTLY the same resolution that EE uses - and get exactly the same "zoom level" as you call it.
Again, it's my guess that it's ~1280x720 - depending on your native res. They probably detect your ratio based on desktop resolution and go with the corresponding compromise and scale the UI so it fills the screen entirely.