I've not had a problem with Best Press and scorching, other than on my wool pressing mat. I now cover the mat with an old diaper. That does eventually begin scorching, too (the diaper, not the fabric), especially if I'm pressing a large number of units at one time.
When I started using Best Press, I pressed immediately after spraying. Then I found that I preferred the results and the process if I wait a few minutes until the liquid soaks in. So I'll press units on the right side on my wool mat, then place them next to my wool mat still right side up, spritz the seams lightly, then go on to doing something else for a few minutes. I'll then go back and turn the sprayed pieces over on the pressing mat (they are damp but not wet) and press the pieces on the wrong side. Once my ironing board cover (a piece of flannel) gets stiff with Best Press, I just wash it.
I'm sorry you're having this frustrating problem! I'm thinking it's something to do with your iron. I go between 4 and 5 on my iron dial (6 is the cotton setting).