Accel 7 tuning

[1bad68cat]

Here's my concusion/thoughts:
If compression is good on all cylinders.
If you know the manifold seal is good to head.
If you know the Injectors are good.
If you know Spark is good to all cylinders.
If all plugs look the same on each bank (good 1-4 and lean 5-8)
If you switch the O2 side and it repeats but opposite (fat 1-4 and good 5-8)

For all the above questions yes.

Then I would lean toward the ECM--possible injector driver issue? Wiring Issue? Low voltage to one bank?

Not what I wanted to hear. . Is this something I can check before calling the Accel Tech Line? If not, I guess I can upgrade the ECM.