So I can explain what's happening here, and what the difference is between the $30 home depot mat and ours. This is a difference between Polyurethane binding and Vulcanization.
Polyurethane binding basically takes the rubber particles and glues them together, in doing this leaves voids and...
This turned out awesome! Well Done! We would love to offer this mat but there's just not enough volume yet to justify keeping it in stock. So happy you could make it work!