Increase suction of Medela pump?

I have a Medela automatic breast pump that I use purely for pleasure. I really enjoy it but I would like it to suck my nipples harder.

Any mechanically-inclined folks and/or physics geniuses have advice on what to adjust or how to modify it?

I’ll see if I can post pics of my set up, too.

PS - pls don’t suggest buying a new one, that’s not an option rt now.