To answer your other question, I still only offer Joe one breast at a time. I often offer him the same breast twice in a row, if I don't think he really emptied it out the first time. But I no longer really have to think about this. And he has NO PROBLEM sucking the milk down, no matter full my breasts are. He's now like "Yay! MILKY boob!" (He doesn't talk, but he shows his appreciation in other ways!)
My breasts have self-regulated, and rarely spray or leak anymore. So while I am still a habitual one-side-feeder, and I have never had a problem with low supply, I haven't considered my supply too high since four months or so.
High supply is hard at first, but it ends up being a blessing. So many women struggle with low supply!