It looks like you just missed 1 thing, Steve.
I held down ALT when I added the 0.1 stretching to the limbs. That way the property was edited for all the selected bones at once.
If you select both limb segments and then edit that setting, it will only apply the change to the active bone (the one you selected last)
Hope that helps.
I can see you’ve posted that file (which is how I discovered your issue) – but feel free to amend that submission before I officially grade it 😉