What Counts As A Normal Deadzone, Mine Reads 0.08 And I Do Not Know If That Is Bad

Both of your readings are normal and there is nothing here to fix. Since you asked for a reference point, here is the one I use on this hardware.

For an Xbox Wireless Controller, a resting deadzone of 0.03 to 0.10 is the ordinary range across healthy units, including brand new ones out of the box. Manufacturing tolerance alone accounts for most of that spread, which is why two new controllers off the same shelf will give you different numbers. From 0.10 to 0.15 is worth watching but not acting on. Above about 0.15 you are into territory where it will start costing you fine aim, and above 0.20 you will feel it without needing a test.

The more useful measurement is the one you have accidentally already taken: the difference between your two sticks. Both sticks in a controller came from the same batch, were assembled the same day and have aged together, so a large gap between them means one has worn and the other has not. Your gap is 0.03, which is well within normal variation. A gap of 0.08 or more between sticks on the same controller is a better early warning than either absolute figure, because it compares a stick against its own twin rather than against a population average.

So: write both numbers down with today's date and leave the controller alone. Re-test in three months. If the left stick climbs while the right stays put, you have caught wear early. If they move together, that is normal ageing and not worth attention. One thing not to do is reduce your in-game deadzone below your measured resting value to feel more responsive. If your stick rests at 0.08 and you set the game deadzone to 0.05, the game will treat your resting position as a real input and you will drift in-game on a perfectly healthy controller.