Wind up can and does exist with a wire driven tail system. Back when I was flying for GMP we found that we could raise the gain on our helis quite a bit by going to a larger stiffer wire. When the Stork was introduced, I transplanted the entire belt drive system off of one onto one of my Competitors. I was able to raise the gain almost 100% with out the tail wagging. Nothing else was changed except the tail drive system. When I converted my first X-cell from wire drive to torque drive, I was again able to raise the gain on my gyro. There is a reason that most helis have gotten away from wire driven tails and that most of the top helis all have either torque tube or belt driven tails. Go to a major Fai contest and check those helis out, that bunch are the first to try anything new and the quickest to drop anything that doesn't work. Most of them have stuck to torque tube drives for a long time now.