moving averages

Many traders trade buy equities when they move upward through a moving average eg 30 or 50 day.
There are however so many equities below those two reasonably common moving averages, it may be necessary to alter the MA used to say 5, 8, or 13 day MA's, to pick up the movement in reaching the 30 or 50 MA's.
Since these equities have been in a downward trend and are just turning, tighter stop losses may be needed to protect capital.