1) Look closer, you RD DOES move - its more pronounced when you're on a smallest cog (11T)

2) Q Ring and Biopace are 90 degrees out of phase. The biopace design had it EASIER to pedal during your downstroke, with the "long end" of the oval coincident with the dead spots in your pedal stroke. Q ring is the opposite. The long end of the oval is coincident with your down stroke, so you're making more power when it matters most, and making it easier to pedal during the dead spots.