I don't know a whole lot about WC, however I'd think Yews and Magics are the best ways to make RSGP via WC.
You get somewhere between 100-300 Yews/Hr at a high WC level, depending on where you cut, and the amount of competition you cut with.
So 100* 490 = 49k, 300*490 = 147k
Magic I'm not sure at all, How logically It'd be under 150/hr.
So 150*1300 = 195k/hr
The bad news for you is that I've been very optimistic with these numbers, and you'll need a high WC level to have a chance to obtain them.
Hope that helped though, but I would recommend bots OTHER than WC.