ECU FROM EBAY WITH SUPPOSED MUGEN CHIP
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Every setup is unique, and will require different fuel maps, those maps are no were close to where it should be.
VORTEC FMU
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If you want it to last for god sake get rid of the fmu, all they do is increase fuel pressure, spray the shit out of your injectors that are already to small. 8to1, 10to1, 12to1, the ratio doesn't matter, there not reliable. Your not running the correct air/fuel ratio
You said you have a bung for a wide band. Do you have a wide band? if so what is the A/F reading?
the stock injectors have to go they are 240cc, you need atleast 450cc dsm injectors
The duity cycle on the your stock are probley close to 110% with the fmu forcing all that fuel in there.
get the 450cc, get your ecu tuned, I guarantee that you will pick of a ton of power. You have alot of money and time in the motor, dont drive it unless its your only way to your tuner.