Not who you asked but I use overhand hook grip and do conventional deadlifts (not sumo). I find mixed grip bothers my bicep on the underhand side. I also use ch

Not who you asked but I use overhand hook grip and do conventional deadlifts (not sumo). I find mixed grip bothers my bicep on the underhand side. I also use chalk, and straps for heavy pulls. I don't understand a gym that doesn't allow chalk.