I was under the impression that the compression is firmer in the WC edition. I tested the Atherton tune in a couple different RC4 length shocks (9.5" and 10.5") and it was referred to as the WC tune or the Atherton tune by Fox. I think the firmer compression might be not working out with the double progressive curve of the bike. Do you have the bottom out closed as well? I know you said you don't like it but there are lots of different tunes and you might have a firm tune for a neutral curve bike when the Evil has a more complex curve. Could be giving you too much mid stroke support with the combo.the World Cup RC4 is no different than a standard RC4, just limited edition and was on sale months prior to the standard RC4. the 40 WC had the different compression tuning.
when my CCDB arrives, ill be able to see how a different shock performs on the bike. i am glad i did get the WC RC4 over the DHX which was the only option for the Revolt when i bought the frame.
everyone is different like you said. i prefer my Curnutts and or my old Avy over the Fox options.....but thats just me