HIGHBB. With this method each DU buy is triggered when the upper Bollinger Band crosses down the last buy price.
DOUBLE_UP_CAPset to 1. Each DU buy is for 1:1 the amount of quote units already owned.
DU_CAP_COUNTset to 2. A maximum of two DU buys are allowed.
DU_BUYDOWNset to 1. The minimum required price difference for a DU buy compared to the buy price of the previous order.