You could remove the condition set that checks the price falling 20 ticks, and just set the limit price each time the current high series is set to the market price minus 20 ticks if this is what you want.
Note, you would need to set the price for the order to a variable, and submit the order in a separate condition set on each new bar to keep it alive.
The example below demonstrates setting the price to a variable and submitting an order using the variable as a price on each new bar.

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