I'm curious about how large your manure pile is. That many bags of shavings each week landing on the pile . . .
We bed per need of horse. We do not have any hock sores or rub marks. Some horses trash the stall and need shavings added daily. Others are so neat with their manure and urine spots, you hardly know they were in over night.
Our mats are not to save bedding but to save the stall floor. If no mats, the urine would sift into the stall base and have to be dug out each day. After picking, I typically leave any wet spots open to dry for the day. If I have time I lime the stalls on the weekdays but for sure on the weekends. We do not use 5 bags per stall and we do not have an odor issue.
We have a 3 large bay compost bins we rotate manure piles over and the 3rd pile is spread on the fields. Very rarely do we have huge piles as the process has us spreading 2 times a year spring and late fall.
When I talk about people with rubber mats and little bedding I am talking about people who don't even put in 1/2 a bag more like 2 shovel full of bedding that's it. And these are stalls where horses are stalled at night no run ins attached.