I see, thanks for the info.
I read in CamLevel's thread that it forces the camera to look forward, so obviously it's the intended behavior. Therefore, uninstalling FlipCams won't change anything. You could keep it installed and use it when you're not using CamLevel, or your could even define your FlipCams cameras in relation with CamLevel and use them both together (for example you could have one FlipCam "attached" to the front bumper, one inside the car, one on its roof, one on the rear wing, etc.). They all will point forwards, but it's still better than a single cam.