Revert "a5 to a15"

This reverts commit 8b0a429049effd25beca8c3621a7cf7b53f8d76a.
Revert "Switch to a15 instead of a9"

This reverts commit aa59600f4a7b7af582680b19e3ada1f86ae95516.
Revert "Optimzations for 4.10"

This reverts commit e61c46ee469fc74c2e86462638a9639d3441595a.