How to correctly set timing on 107??

[Bondavi]

My car keeps having too far advance when under revs. I changed out the ignition distributor to rule out the springs, but no luck.

Do I set timing at idle WITH or WITHOUT vacuum connected?

Assuming vacuum connected, I set at 16 degrees BTDC, but when I rev up to 2800 rpm it goes to 35-40 degrees, not the spec'd 25 degrees!

What the heck?! What could be the culprit? Vacuum routing? No vacuum leans as far as I see, idle is nice and steady.