Agreed.
Currently, we have them at Str 13, Dex 14, Con —, Int 16, Wis 16, Cha 12.
The lower-CR ghast has Str 17, Dex 17, Con —, Int 13, Wis 14, Cha 16.
I'd propose boosting the stats to: Str 17, Dex 17, Con —, Int 16, Wis 16, Cha 16.
I like ranged touch with no save for hurl fire, and agree with boosting fire damage to 1d6.
Sound good?