How to stop horrible printing when sitting down and carrying at 4-5 o'clock?

I carry a CZ 75 PCR between 4 and 5 o'clock in a cloak tuck 3.0. This works great 95% of the time. In fact, the only time it doesn't work well is when I'm sitting at a bench where my back isn't covered. When that happens, I can feel my gun practically flopping out away from me and printing like a motherfucker. What can I do to prevent this? I like my setup otherwise, and I would like to keep it if I can. via /r/CCW http://ift.tt/2ChvkSd