The proverbial anal play roof

Hi everyone

As you might be able to infer, i come to you with an issue.
And that is that although im a huge fan of anal play (My toys too!) and pride myself with how big my ass has gotten over the years, ive managed to stop myself dead in my tracks. And yes ladies and gents, its size issue. Now id love to go bigger than my 'benchmark' 25cm circumference toy, but anything bigger than that, and my pelvis/hip bones and coccyx get in the way of enjoying larger toys...

So please good people, some advice or a helping hand on how i can get round this :/?