The more the leathers are splayed out the more air you loose before they close when you change direction of the bellows. Playing the accordion to its full potential volumn is playing too hard no matter which you say it. So you get what you got, an accordion with the leathers blown out.
I can replace the leathers no problem, very simple task. I wasn't complaining about the leathers just stating a fact that an extremely loud accordion wants to be played loud in certain jam situations.
With other accordions I have I don't have to worry because the notes will bend when I'm playing too loudly and I know when to ease off the bellows