Bah, if you do use a hero mod for the middle age you should use Throne of Heroes rather than WH. Since Throne of Heroes is an update to Wh 1.8 for the middle era only. It is a Turin approved update to Worthy Heroes 1.8. Turin being the creator of Worthy Heroes.
Besides correcting a few bugs in WH 1.8, it does add about 8 new heroes, including 3 for MA Oceania who really needs them. Those heroes were all done by Burnsabre. Shameless plug two
.