So let me clear few things, and please correct me if i misunderstood something.
we must have Nintendont installed in vWii first, the injected game or the Nintendont forwarder in WiiU will actually read the data from the Nintendont installed in vWii correct?
if Nintendont in vWii work fine then the WiiU forwarded channel should work fine as well, as for injected GC game we must use CFW or CBHC for it to work.
now Nintendont work just fine for me in vWii and even the forwarded channel in WiiU using Haxchi, but the injects have a problem using Haxchi, it may work and it may have blackscreen and im forced to reboot, while i like to use Haxchi CFW Mocha in the other hand didnt have problem with the injected games at least for now, i used Mocha for few times with both games and never got the blackscreen, maybe it's just luck but for me Mocha solved the problem for me.
Sorry for the bad English