Congrats. Really glad you figured it out in your case. In my case though (and I think sailor's too) there is no such driver in kexts. And the issue is still there. But it might be useful for anyone else in the same situation. So thanks for sharing.
Have you already tried removing driver kext (Wi-Fi, Sound, Video etc) one by one from Clover/kext or S/L/E? In config.plist I deleted every thing except 3 keys, 'DefaultVolume', 'Timeout' and 'InjectKexts', may be something in config causing this, try cleaning it, good luck