Hi @slapos, yeah, we've been over this. I tried the Gara Stealth and Corsa, both low volume. I couldn't even buckle the boot with the Gara Stealth. I thought the Corsa was going to work but it bunched when flexed (see pic in link), causing pain while riding. 28.4 foot, 28.0 shell.
Intuition Plug Race don't work for me either due to the plastic cuff taking up too much room. Intuition Plug Wrap are the answer for me. Only downside is their thinness makes them delicate and over time I squeezed all the padding away from my heel. Also had to duct tape the back of the heel because it was wearing through. I forced them to give me 100 days anyway, but I need a new pair.
I'll try 28.5 Zipfits per your recommendation first though.