What made you use a scotchbrite pad to begin with?
Rode the bike this am with the OEM cut-down shield. Air flow to crotch/thighs and torso GREATLY improved at low speed. Where you didn't get perceptible airflow before, you now get airflow/cooling. Was not a hot morning, so when at 70-90mph I had the shield raised to about 2" below max height (which is 2" below lowest OEM height) and it felt great for cruising. NO BUFFETING, no noise. I'm 5'9".
My guess is it will be a great improvement on very hot days in the lowest position.
YMMV,
Barry