Alright, here are the pics I promised. Please excuse my messy floor : )
Hoya burtoniae. I hope you can see the midrib, it is more of a subtle thing, and doesn't immediately jump out at you; it is more of a 'dip':
Here is a pic of one of the bronze-y leaves:
A leaf from DS-70. I swear I thought it had more purple-y leaves before, but I haven't been growing it in bright light, so maybe it went away? Notice how it appears much flatter on the surface:
Here are the two side by side:
And mindorensis, for the heck of it:
Q