[Solved] Spline Curvature won't go linear

I've seen in tutorial videos that the Spline Curvature of a Cinemachine Free Look Camera should be making the spline go from linear, to curved.

When I change the slider from 0 to 1, I'm seeing it go from curved, to excessively curved.

Am I missing something obvious about how this spline works?

Curvature = 1

Curvature = 0

Height & Radius Config:

 

That makes sense, but as you can see at either extreme I'm getting a very steep slope between the mid and bottom rig, and very little control over the curve in general. While it looks acceptable in practice, it's not my desired outcome. It would be great to be able to control the tangents of the spline manually or something to create a more balanced curve. I'd preferably like to avoid changing my shots to accommodate the interpolation.

This is my first dive into Cinemachine, so I'm sure I can find another way to get the results I'm looking for. I'll be experimenting with other approaches once I'm home later, but if you have any suggestions I'm all ears.