This is the first I've heard of this for this car. Not responding well to rev matching would be a huge disappointment for me. It could be the nature of the car that you need to adapt to.
For instance my 3 cars, all manual, require a bit of adjustment each time i jump in one. The CX5 has a bit of this numb throttle response you mention. It seems like it requires a little patience and separation of inputs to really nail down the heel toe smoothly. As to where the Miata is much more forgiving.
I've not had to opportunity to look threw what tables mazdaedit has just yet but I'm sure there is some sort of accelerator pedal position translation tables. However I don't feel as this would provide the fix your looking for.
My advice? Just keep practicing. It's free.