The AEM from the Supra works perfectly. The only thing that I am not 100% satisfied is that after I insert the key in the ignition, I have to wait for about 10 seconds for the AEM to initialize, then I can start it.
I had run FMU 12:1 with turbo on my SC400 with boost at 6 psi for a long time without issue. My friend is running supercharger at 6 psi on his LS400 without issue. I'm an old time member here, got busy, so I didn't log on here for a long time. :)
The fuel injectors from Mazda RX7 turbo year around 88-89 are 460 cc/min and also with high ohm. They're the cheapest working solution. But make sure they're cleaned/rebuilt.
I don't track my car, so I can't say for sure if the pad material has anything to do to heat up and crack up the rotors or not. However, I use drilled/slotted R1 rotors (cheap) with ceramic pads and they're fine for streets. Maybe if semi-metallic pads are used, they gets hotter than ceramic...