Abbots are good bows, and I've had several. That said, whenever I've bought a new Abbot bow, the string has been too long, in my opinion. I don't remember what brace height Steve said to set it at, but I do remember that on a new string, I had to put a lot of twists in it to get it there. After a normal amount of stretch, the extra twists I had to put in it to keep it at the recommended brace height put an excessive amount of twists in the string, so I just made a new string myself.
Just because the two Abbott bows I bought both came with strings that were too long doesn't mean they are all that way, of course, but it is possible you could have the same problem.