Actually.... It depends on your limb design. All of my bows are only 2" -2.5" less than AMO bow length. But... i have some serious preload built into my designs.
Soooooo..... You might want to play with a bit longer string and see how it treats you. Lower brace heights typically give you higher string tension at brace, and better performance....
Your question about "long bows" and "Recurve bows" and best string length, is a lot like asking about what size tires are best for Cars & trucks. Kirk