There is not a lot of information around concerning HA candles.
I have done considerable study on these creatures.
I give 3 pieces of advice in using them........
1) DO NOT use the HA smoothed method - it has been proven to fail seriously.
Use only HA candles.
2) When using HA, set your program to have the ask and bid (buy and sell) lines visible on your chart.
Then you know what the real price action is doing.
3) NEVER use the HA candles on their own - use a confirming indicator.
You don't need a million of them, just one will do.
An excellent way to use HA candles is in conjunction with the Bollinger bands.
When the price action walks the outer bands, the HA candles clearly indicate the start and end of such trends.