Downwind
What everyone has said is good advice. Obviously you are going in downwind due lack of choice. You cant look up any performance figures for downwind approaches but check on the helicopter's downwind and cross wind limits, also make sure you are not nose heavy. I once had problems at 4000 feet in a nose heavy downwind approach in a 206; couldn't stop the forward movement, most embarasing! Also try a practise approach in an unrestricted area at various weights.