I've only got 18,000 on the bike and they bottom out on every good hole & bump. the air assist isn't leaking air or oil. Tried different pressures.
The ole lady and me add up to 350.

 

Welcome to HDF!

My wife and I had bottoming problems with my old Glide and even new Ultra owners also complain. Riding solo almost any rear suspension units seem OK, but as soon as we ride 2-up many of them are found wanting. My solution was custom-built Ohlins from HDF sponsor Motorcycle Metal. We haven't bottomed out once since fitting them!