I have followed AN2493, and think I have tried everything, but I can only get low power unless Vcc < 2V then Stop3 Icc is a few microamps.
But at 3V, Sleep current in Stop3 is 70 to 100uA, at 3.3V it's over a Ma..
I have removed every component, except the GT16 and some switches, and still get the same results.
I've tried all unused ports both as outputs low, and inputs with pull up's enabled, still get the same results.
I need to wake up with a keystroke, so can only use stop3..