My guess is this type of materials aré moré for a comfort print, in other words, like an sponge betwen two diferent Stiff materials in order to give them a moré orgánic beavior and avoid the harsh and sometimes plastic feel of.... Well... Plastic.

meabe the problem is not coming from the material itself, but from the desing and use you aré giving it, Meabe as a shock absorber or something like that Will do the trick.