look at it this way...you know you have a ton of drag on the left side......when you turn left you naturally kill lift on the left side combined with the induced drag of the camera and your in a stall or just above a stall the tail tends to settle just before a full blown stall.
Its just like a twin engine aircraft (props) with an engine out, (unfeathered prop) never turn into the dead engine. the dead engine is drag and then loosing lift on the same side while in the bank, you probably won't get to do that more than once. I know of at least one full scale aircraft that did it, just once and killed all aboard. Rudder won't help.
I suggest, for pictures facing forward, build yourself a cradle to mount the camera at the center of the wing on top. it can be secured with rubber bands. Still a bunch of drag but its centered on both wings. plus it can be tested on high speed taxi before you lift off.
Have fun and good luck