It may not be a issue at all. I'm not a fluid dynamics engineer. But the smooth path doesn't necessarily mean the best flow.
No adhesive used on my insulation job. Just foil tape, cut the insulation in 2 main sections 1 being the bottom of the going up the left side wall. 2 the wall where the filter mounts wrapping remaining 2 sides.
Also it just occurred to me with all the rain we got there is no drainage holes in the floor of my insulation. Don't forget to put these in fellas. A hydro locked motor is not pretty.