No! LSD is not couterproductive for racing!! Always training at LT though is counterproductive. It may feel like its not hard enough to do slow rides, and it is easy to feel that it is a waste of time, but always training full out is one of the most common mistakes that new racers make. If you are always going full tilt you are much more likely to overtrain, plus you will never train your body to be more efficient. The LSD work is necessary to get your body using more fats longer so that you are not immediately burning up all your supplies of ready energy when you do have to go all out. Don't skip your base training! If you do it you will be able to go faster for longer periods.