If I read the measurements right it's a 15mm toe and an 18mm shoulder. 15mm seems a smallish toe to me. Would be tempted to reduce the shoulder to 15mm and put some of the wood back into the spine and extend the middle towards the handle. I do think bats pickup better with the wood around the spine straight down the line of the hands from the handle. I would be concerned about the bat twisting on impact.
What's fascinating is the ability to tweak the concaving in certain areas. Traditionally most bats have the same level of concaving all over. I have a bat similar to Dave's where the top and bottom are more concaved than the middle. It maintains the edge profile but ensures the middle of the bat get's the most wood.