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Strategy settings
In the strategy settings, there are a number of parameters that are responsible for the Sell order auto-drop after a certain period of time. The parameter you need is PriceDownAllowedDrop and it specifies the value in percent of the buy price, by which you can lower the Sell order at auto-drop. In your case, you need to set PriceDownAllowedDrop=0.5 and the Sell order will be lowered in steps gradually up to 0.5% and then will stop auto-dropping.
Note that the Sell order auto-reduction function works REGARDLESS of stops and trailing.