I'm going to sound weak for saying this but, the brake pedal on my Logitech G920 is REALLY hard to press down fully in a quick way, which makes heel toeing impossible,
GTEYE Pedal Springs for Logitech G29 Confirmed! | GTPlanet
Amazon.com: HUAYUWA Soft Damping Block Universal Pedal Modification Kit Fit for Logitech G25/G27/G29 Gaming Racing Wheel Upgrade Accessories : Video Games