You could switch to moving averages, once OB/OS conditions are in and the price keeps trending in either direction.
Stochastics ( like most oscillator systems ) is only of use in sideways markets.
Once a real trend has been established , you're better of using trendfollowing indicators, such as MA or Bollinger bands.
For shortterm, you could use an 8 / 13 period MA crossover system, but keep an eye on your stochastics. Use the slower MA as stop-loss level .
Also, an MACD system could be of some help, if you rely heavily on those kind of indicators.
If you want to trade only with with stochastics, use the same setting of periods, but a longer time frame.
A 14/3 slow Stoch may signal oversold readings on a 3minute chart, while it barely has moved on a 30 minute chart.
If in doubt, refer to the longer time-frame. Underlying longterm trends are more significant than shortterm trends.
regards