How do I do this double wall bounce?

I’ve been trying this double wall bounce in Farewell for over an hour now. I can get the other parts just fine but I just can’t seem to get this jump right and it’s driving me insane! How do I get past it?

I’ve been trying this double wall bounce in Farewell for over an hour now. I can get the other parts just fine but I just can’t seem to get this jump right and it’s driving me insane! How do I get past it?