The air pan/ seal the hood works, BUT your scoop is too low to the hood ( air boundry layer) and too big of an opening, sealing it will catch a LOT of air at speed.
It sill take some trial and error, the solution for you may be seal the scoop and then block off the bottom part of the scoop opening. The "good air" is supposedly 2" above the hood surface. blocking some of the opening makes it smaller so helps with catching too much air at speed. Its some trial and error for sure.
In my experience though, cold air is always better and it will pick up something, how much ? go back to the trial and error comment