Hi. I have a character, which I have sized to about the same size as official Unity characters. The rigidbody’s drag is at 13.29. I found that a gravity from around -180 to -210 looked more correct, because -9.81 makes him fall super slow.
When the gravity is that high, he can’t move anymore, using AddForce. Drag doesn’t affect it at that stage. Actually, changing the movement speed doesn’t help, unless you start putting it over 20 000, in which case it starts acting unnatural as well - weird transitions between moving and not moving, inresponsive.
Changing the scale could work, but it would him him superbly small compared to standard assets, and I wouldn’t like that.
You’re setting the values way too high for the physics engine to handle correctly. -9.81 is realistic gravity; the character is falling slowly because you’re imposing massive unrealistic drag (which in reality would be nearly 0). Take a look at Unity’s default character controllers and scenes for an idea of how to set this up correctly.
How did you even get yourself in a situation where you needed such extreme values? I use 1 unit = 1 meter for everything except pixel art 2D games where I use 1 unit = 1 pixel just for ease of use. In that case I have to tweak gravity a bit, but nowhere near as extreme as what you’ve done.