Instead of having a fixed Hedge Ratio, allow it to be set via the value of an Entry Rule evaluation.

For example;
Close(0,#bench)<=ema(200,0,#bench) & 0.50 // 50% hedge ratio

Eval(Close(0,GetSeries("$VIX"))>=30, Close(0,#bench)<=ema(100,0,#bench) & 0.30 , Close(0,#bench)<=ema(200,0,#bench) & 0.70) // selects either a 30% or 70% hedge ratio