Did some checking looking for a good scalping COG setup and the 200,2 and 150,2 work pretty well in the tester on 5 minute charts. Whatever median crossover you have currently going, it's best to stick with that trend until it changes. Once the trend is set, it lasts for a good long while. So if the median crossover is bullish, it's best to look for long positions only, sometimes for a day or so. Same with bearish crossovers.