Almost forgot, there’s one other thing to check, was your cocoa the full-fat variety, with 20% or more cocoa butter by weight? Brands such as Hershey have only around 9-10% cocoa butter by weight and can sometimes contribute to a dry texture.
I have been asking myself if all cocoas have the same relation weigh/volume.
I feel that my chocolate domingo cake tastes different o is bitterer o drier,
whenever I use different brands, but I never thought about cocoas?different % of fat.
Anyway, the Domingo cake is always welcome, dry or not.