Hi JP.
Where did the bone start in Edit mode.
The transform channels are relative to THAT starting loc and rot.
Because I wanted my control to move a max of 1.5.
I placed it a WORLD -0.75 on the x axis. (in edit mode)
Then when you jump into pose mode and move it 1.5 in the positive x (transform space), it will actually be 0.75 on the World X.
I hope that makes sense, You really can put the starting position anywhere, but I chose a location that would make it symmetrical.
Let me know if you’re still stuck!