Okay, Abilities.
The regular Thrall has two odd and four even (Str 11, Dex 14, Con 12, Int 10, Wis 13, Cha 14), so I'm tempted to invert that for the Exalted Thrall and give it four odd and two even.
Maybe Str 11, Dex 16, Con 15, Int 13, Wis 15, Cha 16?
For Saving Throws, I'm dithering...