Glad you got it sorted!
My reasoning behind the battery being the problem is to do with a higher demand required by the higher clock rates, and different governors. Given how they fluctuate clockspeeds dynamically, perhaps not having a constant reliable output (ie old bad battery) could be the reason the OC’d Gameshells flicker. This was just a thought I had while dismantling my unit, and looking at my aftermarket batteries.
Meantime, here’s the “newer” thread.
No doubt with the next wave of gameshell boards and devterm coming out, I will embark on a similar journey and make more custom OS’s.
I’ll also try and keep helping out as much as possible. Good to know that you’ve been able to follow the elaborate cookie crumb trails of troubleshooting!