I think you should also consider the fact that all of the indicators you listed tend to have alot of lag. So, by the time any of those give you a signal it is possible you have already given up some of the move.
I find the effectiveness of any indicator improves when it is used more creatively. For instance, if you decide to go long every time your stochastic comes back out of OS territory, you might improve on that type of signal when it agrees with a few other factors. If it agrees with the overall trend and happens to occur at a significant point of support, let’s say, then i think you improve your chances dramatically of avoiding many whipsaws associated with using the oscillators as a stand alone tool. Changing your settings will not help you nearly as much as other confirming factors.
Just food for thought