Correct, I was unable to alter the amp limit of my controller by changing the 3rd set of numbers in the controller data memory using the programming cable. I was also unable to alter the battery voltage by changing the 2nd set of numbers in the data memory. I suspect that Tongsheng changed their firmware programming (or something else) so these data changes in the data memory do not work anymore. Perhaps it still works for people with older firmware?
It appears that the changes must now be made somewhere in the programming data in the firmware, or perhaps in both the programming data and the memory data.