Looks good.
The only idea I have for your sleep issue is three fold:

1. Run updates. Maybe OS X isn't as happy with the new HW as you think it is.

2. Slap in a temp HD and load a fresh install of OS X to see if it sleeps properly and the light comes on.

3. Try replacing the light / sensor anyway and see what happens.

Click to expand...

1. Done many times, the only thing that comes up is the MacBook EFI update that does not install because of "An unexpected error occurred (0). Your firmware can not be updated"

I believe this is result of my EFI partition being full of MSI Wind Drivers ETC.

2. Will try once I find my Snow Leopard disk.

3. This is the final step and most likely what's gonna fix it.