blackfoot, I'm well aware of all the info you posted.
My situation is that I don't produce much milk. This is one of those things that people say who really didn't want to breastfeed in the first place (lass, this is not directed at you), but in my case it's true. I did *everything* you can possibly think of to increase my milk supply and nothing worked. I was determined (and you know how I get when I'm determined) to do it anyway so I made the decision that I'd rather have skinny babies who are breastfed than chubby babies who are formula fed--all other things being equal. (they are developing properly, meeting milestones, etc) So my first daughter was a tiny thing. She was also somewhat fussy until she started eating table food, which I later (duh!) figured out was because she was hungry.
So with my 2nd daughter I knew I had to do things differently and found a drug you can take to increase your milk supply. It is not FDA approved, for some really asinine reasons, and so I had to buy it overseas and have it shipped here. Extremely expensive but SO worth it. My baby had plenty of milk. She was only mildly skinny, lol. (both H and I are tall and lanky)
So, my concise (LOL) answer to your question is that for financial reasons I chose to wean at around a year and a half. The baby is plenty old enough to subsist on table foods and we just cannot afford, on one salary, to spend upwards of 50 dollars a month on the breastmilk pills.
