The definition of "normal" chlorine useage is different for every pool. If you don't have chlorine being consumed by algae or other goo in the pool, then any chlorine loss that you have is pretty much going to be normal for your pool. A quart of 10%$ bleach in 10K gallons is only about a 2.5 ppm chlorine increase. If that's all you're losing daily, then I think you're doing fine. My pool loses 3-4 ppm a day, depending on the bather load, so I would think 2.5 ppm is an acceptable chlorine loss. You will find that your daily chlorine loss slows down when the water temp falls. If you want to slow it down further, you might try bumping your CYA up a bit, to 50-60. Might make a difference, might not, but you could always try.....