Hey, Willy, your arrows are hitting to the left ' cause they' re too stiff. Which others have already said, but that' s what happens when you have arrows that are too stiff. And when they' re too weak, they hit to the right. To fix this you can either get arrows with a weaker spine, get a heavier point to weaken the spine, or lower the brace height to increase the power stroke which will furthe weaken the spine. But if you arrows are hitting two feet to the left, you probably need to do a few things. I' m not up on aluminum sizes, but get some of what the others suggested and try them with different point weights, but bare shaft them. Shoot them without fletchings and see where the hit. If they hit left they' re too stiff, if they hit right they' re too weak. If they hit where you want them to they' re a good spine. I think you can get some good tuning tips at O L Adcock' s website, which I think is
www.bowmaker.net I don' t really want to get into tuning ' cause it gets extensive in explanation. But that website has some tuning tips and you can buy some books on setting up longbows and recruves and such.
With recurves the string length isn' t really going to change by draw. The string length fits the bow. In your case you' ve an AMO 60" bow, which means you need a 60" string. No one is good at first, it takes time to get your form down and learn how to aim. First arrow I shot out a recurve I hit a block wall. As for figuring out how high or low to hold, you' ll figure that out as you shoot more. With compounds you figure that out by setting your pins, but with recurves you figure it out by feel and your aiming method. You don' t have a pin telling you where to hold, you learn it by shooting over and over. It' ll come though, just be patient and have fun.
Brandan