Hi, if you only shoot C&B a cap rake makes sense. However, if you also use conversion cylinders, there is an issue opening up the hammer gap. The conversion cylinder firing pins don't get hit squarely and the gap peens and widens. The method I use to minimize cap jams is to fill the hammer gap with soft solder and polishing the hammer face. When there is nothing to grab the spent cap, it usually stays on the nipple.
Regards,
Richard