I've got Tektro Oryx (much cheaper and crappier than yours) and it stops pretty well...perhaps you may have "good feel" but it could mean you are having pretty low mechanical advantage. It does give you a tight feel but it's actually losing power.
More distance you pull, the harder Force on the brakes it gives you. Less distance to pull, you need to apply more force into your lever to achieve the same force on the brakes. So if you set it up in a way that allows you only very small distance to pull, you'll have to pull extremely hard on the lever to get enough force into your brakes.