You seem to be turning nothing into a problem. Curing doesn't happen because there's extra space in the jar, it happens because there isn't any oxygen. You can do whatever you want. People just don't fill it up because they don't want to smash bud or they want to leave some space for the evaporated moisture to sit.. if you don't need to burp anymore you can stuff it. if you do need to burp that means there's still to much moisture in the buds, and packing a jar to the top can create mold hella fast.