It looks like the clamshell "tips" are stopping too far down. You adjust the stops underneath a few clicks at a time until the shell is level. You may want tips a hair below the "tab" piece so that you don't get them whistling in the airstream.
The stops look like black plastic strips underneath the shell tips. As I recall you slide and click them to raise or lower the stop position. You can get to them with the shell up in service position
One day I had some garage time and started fiddling...sorry I can't refer you to a manual peocedure
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