User blog comment:GAMEONBOI/One for all/@comment-35202892-20180720023304

theres theories that deku has never been actually using his 100% but has instead been using around 50-75%. This is quite like when midoryia claimed 1000000% punch recently, we practically KNOW it wasnt one million percent but it was just him hyping himself up. Just a thought.

Deku also hasn't really ben able to increase his quirk itself yet, he's only been able to increase the amount of the power he can use bestowed by All Might, which means he still is capable of increasing One For All's 100%, meaning he can increase the maximum output he can use, increasing strength and speed as time passes and as his body matures.