How to print booklet on A3 paper without bleed in centre?

Hi there,

So i've been trying to print a square book (8'25 x 8'25) and I tried printing it on A3 paper so that there would be two pages per piece of paper. I do this on Adobe Acrobat Pro and use the "Booklet" setting when printing and the layout of my pages are all correct. However, the only problem I have when it prints out is the white

space (Bleed?) in between my pages. The bleed on all the other sides of my booklet are ok because I can just trim them off however I can't trim off the white space in the middle (staple binding).

Here are my printer settings

That is the result when I print ^

Thanks for your help.