The good proc was reduced by 2 reasons.

1.- Precise Touch. (with the old rate Precise would be OP)
2.- Heart of the Crafter. (Lower rate generates insentive to use these idiotic skills we dont even need)

Before good were common but not as to grant permanent 11 stacks ALL the time, not even close, there is a reason why every crafter will always roll reclaim and rumination on the most demanding crafts that absolutely need said 11 stacks (masterbook II). But yeah, it was nerfed, not even mentioned in patch notes probably to prevent a fire in the forums (which is silly considering the status of crafting...) and well, thats it. Old proc rate + Precise touch = OP.