Too small of a leak not to hit spring pressure on a single turbo setup, you can't even hit 14 psi when your building boost.
Any system will hit more even with a leak twice that size.
The leak wont help but that's not your issue.
Okay, that's kind of disappointing to hear.
If that is the case then we can rule out the main issue being from the output of the turbo to the throttle body.
I'm not sure what you mean by the wastegate being stuffed. It does freely open and close when pressure is applied to the bottom port. However, I do hear and feel air being released from the stem portion which feeds into the top part of the wastegate with the spring. I assume that is normal though.
I forgot to mention that when the car is on idle, I do feel some exhaust fumes coming out of the dump tube.
Is there a way to test if the wastegate is leaking while it's installed other than feeling around it with the car on (I did do this and did not feel any pressure for the record)?
Maybe using some seafoam will help show where it can be leaking from?