Thank you Thomas, very interesting post.

Basically you've upgraded your pack to a high quality one with a 5,5 mOhm impedance. Plus you've used high quality 13AWG harness between the engine and the ECU.
Am I correct ?

Do you have a very sensitive hall effect amp meter to record peak current consumption ? You should read up to 30 amps in that case.

Also note that the Lipo rating does not ensure that the pack will do the job properly

It only says that you will not destroy the pack at this rating. So a 30c continuous 3000 mah pack will not be destroyed at a continuous 90 amp drainage.
However it might drop the voltage significantly to a point where the electronics cannot operate the start any more. Once again, the pack impedance rating is the only significant parameter on that respect.
Too bad that the battery manufacturers don't publish official impedance figures for their cells.

The best source I've found on that respect is Nobs:
http://www.hangtimes.com/giantrxpacks.html