So I have a 72" Huntsman longbow. The string is gettin old so I measured it to look for a replacement only to discover... It's a 65" string. It's the string it came with so I have no idea. Is this normal? I always thought 3" was the recommended amount so I should have a 69" string. Could this also explain the bend that the slight/moderate bend the bow has in it even when unstrung?