au = separate into 2 syllables, like ah-oo (oo like moon and spoon)
ai = long i sound
You're not making a distinction between 'au' and 'aü'? The first one I think is pronounced 'oh' (as in Aurang = oh-rang), the second is as you've highlighted, although I can't think of any word from the books that applies now.
'ai' is also pronounced the same as
air, unless there is a diaeresis on the i. So 'Imperial Sake', 'my-sun-say', and 'ai-no-nigh'.
That's as far as I know. There might be exceptions though.
Some other words that I disagree with the pronunciation of (although I'm not sure why, just sounds better to me)
Kyranean = Kigh-ray-ni-en
Kûniüric = Koo-nigh-yoo-rick (koo with a short sound)
Ikurei = eye-koo-rey
Istriya = Es-trigh-yah
Xerius = Ze-righ-us
Conriya = Con-righ-yah
Xinemus = Zigh-nee-mus
Eärwa = eh-yar-wah
Eänna = eh-yah-nah
The 'û' = 'm
oon' sounds weird to me in every words except Psûkhe. That's why I pronounce Dûnyain with a short u sound, not a long one, the same with Isûphiryas regardless of what the book says.