I realize this is an old post. Just thought I’d throw my 2 cents in just in case anyone else has a similar problem.
I wouldn’t change the gravity if you’re looking for earth-like conditions. Earth gravity is 9.80665 meters per second. The default setting in Project Settings/Physics of -980 (centimeters per second) for gravity is realistic. If things feel like they’re falling too slowly you would want to change the terminal velocity. Objects in the real world will fall at the same speed until they reach their terminal velocity.
I found UE4s default terminal velocity is set way too low and makes gravity feel floaty. I would play around with terminal velocity before I would change gravity or each objects’ mass. Change anything else and you’ll be creating a whole lot more work for yourself down the line.
In my game I set the terminal velocity to 7600. This would be similar to a skydiver pointing downward with his limbs pulled to his side. It should be good for most circumstances.