Hi. I’m not a big specialist, but it’s weird from the start because both devices use the GTX coil. A few questions.
Have you tried with another coil?
For the Luxe XR Max, which coil head are you using? RDL or DTL? (I guess not MTL, if the coil is 0.6, or am I mistaken?)
On the Armour GS, which coil head do you have? Even though the drip tip is replaceable, there are 2 types of coil heads there too. On one, the airflow slot is twice as long as on the other.