A good question indeed. Well, we've learned from our longspan experience with a good many of inverted sandwich rubbers as follows
-- within a range of 0,3 mm sponges of a type will play much the same.
E.g. 2.2 - max
1.9 - 2.1 mm
1.6 - 1.8 mm
1.3 -1.5 mm
Again, you can see many...