It does very commander mark. Correct me or extrapolate where possible please.
1) I'd NEVER tune with narrow bands and use my Wideband but needed to understand the 300 and 650 limits in correlation to my tune.
2) Closed loop is where the narrow bands make adjustments once engine is warmed up and using all it's sensors to make AFR to it's commanded mark.
This is an accurate statement. To add to it: once you shove your foot to the floor, it's no longer in closed loop, and it doesn't use the O2 sensors to adjust fueling anymore.
3) since the set points are at 300 and 650 respectively then after I do MAF, SD and finally VE table tunes I can then check them out and move them if needed or should I do that in between somewhere?
I'd probably just set both of them at 450 for now and worry about it later or not at all. Most big shops don't even touch these. Also, I'm not sure what you mean by MAF and SD and VE tuning. Unless I'm missing something, SD is equivalent to VE, so you do MAF and VE, or MAF and SD, but not MAF and VE and SD.
4) So the bank 1 & 2 tables 0-64 actually use those voltages from ? to determine whether it's in VE, MAF or SD nodes then? If so where do I check that when engine is running to double check and be sure that my current tuning logging is being setup and recording the right things?
No, neither the airflow modes (0-64), nor the voltages you put in those tables have anything to do with whether you are in MAF or blended or VE modes. Based on my guesstimate of where you're at with your tuning and tuning knowledge, I'd just set the min/max to 450, leave these bank 1 and bank 2 tables alone, and come back to them much later. It won't hurt you- all of this stuff is fine-tuning that only us hobby-tuners bother with, honestly.
5 & 6) very nice thanks much for the details. Now WHEN during my tuning is it best to make these adjustments? After MAF but before SD?
I'd save it for dead last, if at all.
7) What's EOIT? Also it seemed like my tune had a straight 450 across the board on bank 1 & 2 and my Stoich was also 14.7 straight across. Would there be any advantage to changing these values in bank 1 & 2 instead of straight 450 to different voltages like on a 08 Hummer or 13 Corvette?
End Of Injection Timing. It determines when the fuel injectors fire during the rotation of the motor. Honestly, if you don't have a cam, don't even bother with it. Regarding the voltages, as noted above, I'd just set both tables and your min/max to 450 and leave it be while you're tuning. Or if you just set the min/max to 450, it effectively overrides the Bank1/Bank2 tables.