One problem is that there is only one (1) bone for all angles, for each body part, so if you change the bone length in angle 0 then that length will be the same for all the other angles.
You need to adjust the bone size once, then adjust the sprite size, position, and rotation for each angle.
If you are loading a single sprite for all angles use the "Add Full Angles" (Ctrl-N) function, then adjust as needed or add the first angle, adjust, and use the "Sprite Angle" panel to "Copy Similar" to the other angles.
Also check out the manual on this HERE
See my CTA Tutorials on the YouTube channel CTAStepByStep
Check out EZColors for CTA. The easy way to change Render Styled (RS) colors.