As for the difficulty in controlling the plane, have you tried training mode? This is activated when selecting the 'small' aircraft. If in addition you slow down simulation to the lowest value, 70%, you will have a much better chance to control the plane.
Flying RC 3D aircraft is in general quite challenging. And using the oculus controllers makes it even more challenging because (i) they trace a circle and (ii) they don't have proper feedback near centre to apply small corrections to the 3D plane.
In any case, please try training mode and see if it gets any better. On my todo list is a mapping from circular to square inputs which should help somewhat with (i).