Here are the settings for smooth video movement with  panning/yaw/rudder of the Phantom 3 & Phantom 4 and most controllable tilting of the camera, making steady cinematic shots much more attainable:

On the Remote Control:

• Lengthen the sticks. This allows finer resolution of physical stick input.

In the DJI GO app:

MC Tab (in “Advanced”):

• EXP: Normal: Throttle .4, Rudder .25, F/R .4 (this rudder EXP setting REALLY chills out the pans near center stick)
• EXP: Sport: Throttle .4, Rudder .35, F/R .4 (do whatever you want with Sport settings, personally I don’t use this mode for “smooth” shots, more for fast high-energy shots)
• Sensitivity: Yaw Endpoint – 110 (this is a big one nobody talks about.  It limits the “throw” of your pan/yaw/rudder moves, decreasing overall pan speed and essentially increasing the resolution of your pan movements.  I have found that no matter how low I go on the rudder EXP setting, the Yaw Endpoint setting is the real key to chilling out the panning on the P3)

RC Tab:

• Gimbal Speed – 60 (personal taste, but I’ve found this setting to work well with the rest of the gimbal settings below)

Gimbal Tab:

•  Gimbal Tilt EXP – 20 (allows finer resolution around the center detent of the gimbal wheel)
• Gimbal Tilt SmoothTrack – 22 (this is MAGIC and nobody talks about it, kinda like the Yaw Endpoint. SmoothTrack automatically smooths out the start and end of your gimbal wheel input.  It can seem really spongy at first, but once you start getting used to it, doing nice long sweeping tracking shots or horizon reveals, you’ll never turn it off)
• Enable Synchronized Gimbal Pan Follow – OFF (this keeps the gimbal centered and lets the P3 aircraft do all the smooth panning work, that way you don’t get the sudden camera jerk to the side when trying to do a smooth pan)

Just keep flying and keep testing and you’ll get buttery smooth video results…and don’t forget that you can test a lot of these settings (especially the yaw settings) in the flight simulator.  The Yaw Endpoint is especially obvious in the simulator…just bring the simulated P3 close to you, hover, and try timing a 360º rotation with various Yaw Endpoint settings.