Another reason why cable is more prone to downward pressure is becaue BOE has exibited much more willingness to cut interest rates, and have done so rather consistently, although not as aggressively as the FED. ECB, on the other hand, hass repeatedly refused to cut rates. That makes cable the prime candidate for shorts against other majors. If the market sentiment is such, that moves the price! That's why I worry about longing cable.
Expected the unexpected