Try with cable sometimes it helps.
But you wont be able to see 8bit as a device in RF settings
i use xbox 360 profile, it seems that 8bit work very similar to xbox 360 controller, and save it as profile but it needs to be tweaked a bit, look up on web for settings there is few different to choose from, bare in mind that controller can behave differently from version to version of RF2 as they change things quite a lot.
Most fun i get is driving AC, RF2 and AM2 aren't as good on controller but that's me
Top rated all time guides for AC - don't forget to check out my set up guide (It works!) I've spent countless hours trying to get a decent controller profile. I have a wheel but I have to set it