User blog comment:Mythomagius/One For All pushed to the limit/@comment-35975040-20180713093104/@comment-35202892-20180713155906

Well i talked to my friend a while back(he reads the manga) and he said that All Might has to lower his power levels and constantly concentrate to regulate them, and seeing as how his muscle form is basically one for all boosting his muscles, I'd agree that they could regulate it but it would take extreme effort to not blow the hell out of whatever area they are in at the time. Midoryia is obviously different beeing that he only activates full cowling when needed, in his case it would be a matter of using eight gates at the same time as full cowling, however, the amount of power he unleashes during this period would rely on what level he can use on for all without drawbacks.