I'm looking at your TZA chart with BB(50,2.0) and ENV(50,4.0). The gains say Mar 7th but the trade was signaled on March 4th and Closed out on the 10th for a 6.6% gain.
On the 7th - price went against your entry price by at least one full point and it does not look like there was a swing low before that to give you a level for a stop.
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