I don't mean this as a slam against anyone, and I won't call any names, but in the last 20+ years I've been tinkering with strings and asking questions one thing is for certain...a lot of very well known bowyers (some former, some still making bows) don't know diddly about strings. I've seen Flemish strings called "less accurate and could be dangerous"...but shipped with some bows anyway. I've seen a warranty state that it was null and void if a Flemish OR dacron string was used (you read that right--warranty void over dacron). I've lost count of the times I've heard the string get blamed for everything from delaminations to limbs twisting to noise to whatever. Saw one guy (not a bowyer) claim his string made his bow pull 4# heavier than the 14 strand Dynaflight '97 string that came with it--everything else exactly the same. Drives me nuts...
I don't know squat about making a bow, and won't hesitate to tell you I don't. I have been studying strings and string materials for over twenty years, and that includes asking bowyers all sorts of questions. IMO, some of them are great and honest but just a bit misinformed. Others, well...
I've been up and down and round and round with several about marking their bows correctly according to AMO, or simply marking the actual string length (ASL) on the bow. That tiny bit of ink would make life so much easier for everyone involved, but...so far nobody I spoke with would agree to it. Good to see some are.
Like Frank noted, AMO is a word that's used very loosely, especially in our side of the sport. Lots of people that use it don't know what it actually means. Best way to get the correct string length for a bow...measure one that fits it.