This is a linkpost for https://atheistkit.wordpress.com/ethics/
Saying that a thing is "hedonistically good to do" means that it is good to some extent. It does not tell us whether it is good to do, period. If it is good to do, period, it is morally good. If there are other considerations more important than the pleasure, it won't be good to do, period, and so will be morally wrong.
It's not helpful to define the morally good as the "good, period", without an explanation of "good, period". You are defining a more precise term using a less precise one, which isn't the way to go.