In my ongoing search for the perfect arco string, I thought I'd try something different and focus on just one element: What string do you find is the most response to the bow? So without thinking about all the other critical things (sound, feel, tension, breakage, etc.) what string can be grabbed by the bow the easiest and cleanest? In the past, I've used (in order) Helicore Hybrids, Corellis, Obligatos and Flexocors ('92). I'd put Flexocors at the top for bow response….