That AMUR does not look bad at all? That 427 table is just so wrong... I've seen some huge issues with GM tunes, I think it was 1project2many who described the procedure. First engine dyno produces MBT, that's where it should have stopped! But then had to pass emmissions, then drivabilty, then emmissisions? Either way I don't think their software was as good as we have today so they just grabbed an area and fixed it! Hence the huge spikes and peaks. It passed so they were done, never really a fine tune. Just a theory... But looking at newer stuff is much more fine tuned. So were they trying harder or did software and technoligy make it easier? Remember the dates, computers and software of the era of ECMs we are talking about here?
In the end data is king and the engine will run better with correct fueling. But in the final stages fueling will not be exactly smooth. Point of smooth tables was easier to tune to what engine wants! Data will be consistent, this way all the varibles will work properly. What happenes if you enter PE when BLM was changing from 128 to 168 to correct for wrong VE table? Well you don't get proper PE! Remember everything is an adjustment to main VE table, AE, PE, DFCO, choke... everything is an adjustment off main VE!
Also important point for anyone reading this, this is theory of 1227747 $42 VE. Other ECM/PCM may have areas that are not smooth nor are they supposed to be, for instance a PCM with 2 fuel tables for Idle and Off Idle, Off Idle should be smooth, Idle will not, there are areas that have to be close for transition, same for 2 spark tables. Other masks have other adders or subtracters that have to be considered.