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,
TrueBrake V2 – Mod for Logitech G25/G27/G29/G920/G923 Brake Pedals (PRE-ORDER) – AXC Sim – Sim Racing Products
Logitech G29 Cheap and Simple Brake Mod For Sim Racing - Get Load Cell Firmness and Muscle Memory - YouTube
Brake Pedal Mod - Logitech G920 Racing Wheel - YouTube
BBJ SimRacing Logitech G29 & G920 Progressive Brake Mod System - YouTube