I can’t reproduce your results. We should be in a down trend/swing as long as the lows of the candles is lower than the highs of x previous bars. From that we can conclude that as soon as a low of a candle is higher than the high of one of the previous x bars, we are in an up trend/swing. Thus, from your USDJPY M30 example I marked the lows of first green bars and the highs of the first candle of brown coloured candles with white lines. Now I counted the number of bars until this white line was above a candle’s high or below a candle’s low. But the number of bars is absolutely not consistent (possible results from x = 2,…,4). What went wrong?
