Crash in Alexander DX11

So I just installed a new video card and decided I was going to try the DX11 client to go with it.

Radeon R9 380, Catalyst 15.7.

Everything is fine until we get into Alexander. First section went fine, but as soon as we got to the fight where you use the bot to pull bombs out... I'd crash at right about the exact same point of the fight. Strafe to dodge something, start casting a spell... crash.

I can't find an error log either. Just "game client closes" crash.

FC mate suggested I roll back my driver, but I don't have any old versions and the website isn't exactly easy to navigate. I don't know which driver to look for searching Google manually... help?

Even just the version number of a stable, working driver with DX 11 would help.