How about drawing trendlines breakout for exit, i.e. after taking the positions with 315 (long or short) draw a trendline and wait for the breakout of the trend to exit or ADD.
Like in the chart below, the current trend breakout is almost on 5100 upwards and in downwards it can go upto 4750 (but it varies day by day and have to check the trendlines daily) so we can expect a range between those point and breaking out those levels will break the current trend.
I know this trendline thing in not in 315 strategy, but particularly I like to add this trendlines for EXIT.
Like in the chart below, the current trend breakout is almost on 5100 upwards and in downwards it can go upto 4750 (but it varies day by day and have to check the trendlines daily) so we can expect a range between those point and breaking out those levels will break the current trend.
I know this trendline thing in not in 315 strategy, but particularly I like to add this trendlines for EXIT.