You should also try ig-platform-id 0x59160000.
And you should install Clover to your main system drive.
I have tried the following combinations:
- ig-platform-id: 0x5916000, FakeID: 0x59168086, AAPL,ig-platform-id: 00001b59, device-id: 1b590000
- ig-platform-id: 0x5916000, FakeID: 0x59168086, AAPL,ig-platform-id: 00001659, device-id: 16590000
- ig-platform-id: 0x5916000, FakeID: Commented, AAPL,ig-platform-id: 00001b59, device-id: 1b590000
- ig-platform-id: 0x5916000, FakeID: Commented, AAPL,ig-platform-id: 00001659, device-id: 16590000
- ig-platform-id: Commented, FakeID: Commented, AAPL,ig-platform-id: 00001b59, device-id: 1b590000
- ig-platform-id: Commented, FakeID: Commented, AAPL,ig-platform-id: 00001659, device-id: 16590000
- ig-platform-id: Blank, FakeID: Blank, AAPL,ig-platform-id: 00001b59, device-id: 1b590000
- ig-platform-id: Blank, FakeID: Blank, AAPL,ig-platform-id: 00001659, device-id: 16590000
All boot to black with working backlight.
P.S. My Clover is installed on a Win SSD and has always run well in High Sierra. Will try a copy on my new macOS drive but I doubt it will make a difference.