Help with suction

Hi all, I have a big ol boy I’m building that’s a 4ft x 4ft forming surface that I finally finished up yesterday. I hooked up the dinky shop vac I already had and the aneometer is reading between 0.0 and 0.1. I’m looking at upgrading and see the peak HP in most readily available shop vacs is around 6-6.5. Before I go out and buy, I wanted to see if folks had other thoughts or considerations worth being aware of. Thansk