50% entry is key for engulfing candle strategies in order to get a 3R return easily. Price does not always return to the 50% retracement level but in my experience it does about 80% of the time which is more than enough profit when using 1:3 risk to reward. When entering at the top of the engulfing candle it is much harder to pull 1:3 risk to reward trades consistently because it requires too big of a stop loss. With a 50% entry, a 1:3 risk to reward is easily achievable.