Yes that's exactly what I have. I change a subtrim, then servos go to center, but one second later they go back. So it isn't possible to level the swash in such a short time.
I would love if we would just have a checkbox to enter leveling mode, just like on PC software. This would be great for another reason - it would allow to enter leveling mode without changing subtrims, which is great if you just want to setup blade tracking, or if you level the swash mechanically by these servos (I use them and love them):
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What you describe with LED is a different problem. For me it looks like you cannot use "RET / RTN" button at the moment. You have to use buttons in the app (BACK or CLOSE). Otherwise it leaves Spirit in setup mode (blinking LED). Black LED (off) also happened to me few times.