Agreed that keeping the boat from heeling to leeward is the best way of warding off weather helm.
But be sure that it is weather helm that’s your problem and not just a heavy helm. Many people experience this when their rudder blade is not fully down. Don’t rely on an elastic downhaul, fit a 2:1 purchase and pull it on hard. Don’t forget to fully release the downhaul line when coming in to shore though!