Daqiang can't really do healing-healing of other people - its explicitly one of the things he says he has no ability for. He can transfer energy to them and they can use it to circulate and heal themselves. He can use his own to heal himself faster. And he can take energy that is harming someone from them. But actual healing on their behalf is not something he can do.

He might be able to block the curse energy for a time, but that just means it would build up and be very bad all at once when it did effect him.