Stating the obvious, a front mounted motor has most of the air inlet behind the motor mount and motor, and most are fairly sloped back. Perhaps the baffle acts as a bit of a dam to help air up toward the front and perhaps the fan is then more effective with a cool air supply. I did the fan, and then the baffle, each helped an increment. I cut a thin saw line to each side of the opening, guessed the angle and inserted a piece of 1/32 ply and a little Ca. It could have been removed, and repositioned, but worked well enough to stay. Perhaps there is a more scientific approach to position and angle but it did not seem so earlier in the thread.
Good news is that you already have an adequate solution, though it may still be a bit hot in 90 degrees and up.