Thanks for the replies,
I managed to sort it out during a practice day last Friday at MB.
I had almost resigned myself to the fact that I would need a new ESC as the car was simply not boosting on the straight even after updating it to the 5.4 firmware.
After quite a while I did notice that if I went down the straight at full throttle it wouldn't boost and just top out, but at 3/4 throttle it would boost and accelerate and keep accelerating like it should.
After this I ramped everything down on the ESC and it started boosting correctly at full throttle, it looks like for some reason I had the boost ramp set too high which was casing the issue, I've ramped everything back up except the boost ramp and it seems boosting correctly.
Not sure exactly sure why a higher boost ramp setting would cause this issue
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