I found what appears to be a bug, when it came to stats on the bat. In short, a LVL 2 bat I made had both a higher melee and power strike stat, than 2- LVL 3 bats I made. Even with mods installed on the LVL 3 bats, they were still less powerful than a stock LVL 2.
Video of the possible bug
a20, fresh game on pregen map
I searched around, but didn't see something like this reported.