What's the secret to long glide with poles?

Heeding advice of the masters, I do at least one pole-less rollerski
session per weekend in addition to skiing with poles. Turns out, I
actually enjoy pole-less much more - I don't get tired as quickly and
my rythm and balance are way better without poles, especially when I
have both of my hands behind my back. When I try to imitate poling,
glide disappears, balance is all over the place and there's no rythm
to speak of. Also, all of a sudden there's this creep towards the
toilet seat posture. When I go out with poles, it doesn't feel as
awful but still worse than when I keep my hands still. So: how do I
learn to ski with poles?

Just thought of another question: let's say I'm doing a fairly
leisurely V2-alt on a flat surface. If I'm trying to maximize the
glide, what are my arms supposed to do while I'm still gliding? I find
myself in an awkward pause with my arms kind of hanging down and
waiting before going into the next cycle. It doesn't seem right to
stop the glide just to give my arms something to do. Ideas?

Many thanks!