Looks like a nice set up. One thing you an do to squeeze out another bottle maybe is to put a block of wood or something under the carboy to tip it. Put your racking cane in at an angle that grabs the most wort. Like when it's flat, stop when it starts to pick up trub.
Some of us bottle one PET plastic bottle to check the carbonation. Give them a squeeze and you can tell. Also one clear bottle. Keep it out of the light and use it to check how it is clearing.