Just to confirm,
This is the 1-piece water ridge and not the 2-piece tank and bowl set, right?
I actually found that the bowl appears to have some sort of coating on top of the glaze (or glazed really well) and that 'streaking' isn't really an issue.
Haven't had any of the other issues yet (and hoping that I don't)!
Follow-up comment: Is it possible that your flush mechanism isn't adjusted correctly since you're saying that there doesn't appear to be enough water in the bowl in your case? I'll try to take a look tonight at ours and see how high the floats are set (perhaps I'll snap a pic). Also, is it the outer shiny 'lid' buttons that are sticking or the actual internal flush tower buttons that are sticking?