Since you don't have a Boost-referenced system, I would think it would be more accurate to have the injector flow rates on a slope much like that of the stock (only higher values). The flow is going to vary depending on the intake vacuum/pressure. In a boost referenced system, the difference in vacuum/pressure is used to modify the fuel pressure to compensate.
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The VE table is used to calculate the injector pulses. The MAF is used more to provide how much air is ingested. It's not uncommon to see high AFR on a wideband at certain times. This is especially true during decel, the ECM will cut much of the fuel using the DFCO. When you run into problems is lean during accel or tip in. To really know if it's right or wrong, you need to compare the ECM's commanded AFR (or lamda) versus what you are actually getting. It would be easier to look at a scan to see, but it has to be set up to show what to look for.