there are different limits for 3, 10 or continuous. The numbers you have quoted (1520amps is the 10 second limit)
Would be happy to investigate, however there appears to be no evidence whatsoever that this is actually the case. There are no values on the CAN bus that correspond to any alternate current limits. Not sure where you're getting this information, but I would gladly look into it if you had any specifics. As I said, I've deciphered the vast majority of CAN3, including 100% of the messages from the BMS and drive units. A bit of proof is that I was able to write a full emulator for the front drive unit to use for this project (P85++)... The emulation is good enough that it even makes it through a firmware redeploy without a problem. So, if there is something on the CAN bus that somehow I've missed at this point I've love to know about it. But, it seems very unlikely.