Benefits of Smooth Return Boot

In testing my static pressures, static pressure is 0.75” on medium speed when measured below coil and just inside blower compartment, but when measured 18” above the bottom of the return drop I get 0.497” Seems to be very bad turbulence here by the bouncing around the tests show.

Would the curved return boot help with this? And would the turbulence create a false bad static pressure?

Thanks

source https://hvac-talk.com/vbb/showthread.php?2222895-Benefits-of-Smooth-Return-Boot&goto=newpost