I wonder if smoothing out the backside depressions on the shroud might increase the airflow significantly? It would be less work to simply caulk those depressions, thereby reducing air turbulence while maintaining hail protection.
TakingThe5th - Chicago, Western Suburbs
'05 Ford F350 Crew 6.0 DRW Bulletproofed. Pullrite Super 5th 18K 2100 hitch.
'13 Keystone Cougar 333MKS, Maxxfan 7500, Progressive EMS-HW50C, Grey Water System.