As with practicing a musical instrument, it is best to train frequently at less than maximum difficulty and speed in order to focus on the utmost quality, sensitivity, feeling, and flow. Look for subtlety and take the time to reinforce better movement patterns. Over time you can increase the load by adding coordination, speed, strength, and endurance training, but not at the expense of good technique. That is the foundation on which the rest is built. Push boundaries slowly and they will shift naturally over time. As you raise the consistent baseline so too will rise the erratic peaks. Eventually you may find more satisfaction in climbing well than in simply climbing hard.