Add one class to men's upper weight divisions:
205 Lt Heavy
235 Heavy
No Limit Super Heavy
So your super heavies would be 255+ walkaround weight. People will say there isn't enough HW talent out there to justify this, but this could bring some talent in. There are a lot of athletes out there who would have a hard time hitting a 265 limit. Just watch college and pro football one weekend to see a thousand or more of them.
People aren't even going to try the sport if they think they can't compete in it. Open up Super HW, and as people get interested, some of those big guys will make the cut and trickle down to HW at 235 as well.