Finally found it...
<meta name="viewport" content="width=device-width, height=device-height, initial-scale=1.0, maximum-scale=1.0, user-scalable=no;" />
in my own header... Obviously device-height does not take the status bar into account. For future reference...
if (typeof window._nativeReady === "undefined")
window._nativeReady = true;
is the complete answer.
Thank you, keep up the good work!