I am trying to use technical analysis method (Kagi and Renko method in particular) to analyse my high frequency data. I applied those methods over 1 year, 2 years and 5 years high frequency data. I got the positive result (even very small value for my data), but the cumulate sum of return after each sub time interval does not show any trend (I expected it might be stable increase/decrease) which means those methods did not detrend very well and can not extract noises from market well (since the graph of cumulate sum that I got jump up and down like random process). I wonder if anyone has ever used this method in trading forex? Can someone please point me to any literature/material on this matter so I can deepen my understanding about those methods. The only material that I achieve so far is the book of Nison: Beyond candle stick: Japanese charting technique.
Many thanks in advance.