Fan shroud question

To me it looks like the shroud only allowing the fan to pull air from that portion of which is shrouded. Your corners aren't getting pull through? A shroud should also only cover have the width of the fan blades ideally. I'd pull the shroud off and test it. Better? Worse? Same? Then go from there. Fixed fan or clutch fan? How close is the fan to the radiator? I've dealt with same issues. Best thing I did was get a good clutch fan. Even without a shroud it sucks a towel onto the grill at idle! A factory style shroud I picked up will help keep things even more stable.