You are not exaggerating, you have 1500ms lag on the audio? That's insane.
If this were the case for everyone, then no C3 games would be playable on any Android device. I remember some guy created a music rythm game, and even that worked with C3 on Android. Which of course would not work if there was a 1500ms lag when you pushed the buttons.
It has been threads and bug reports about lag, but noting like what you describe I think.
You state that the other engines has lag of 350ms, which is also insanly high. What type of device do you have?