Sorry I haven't read back through everything, were you running a direct copy of the Harris chip from the Ostrich 2.0 or were you running different a modified file before you changed to just the...

I'll be interested in your results and if you can solve it, I have a similar problem with my Vortec headed van.
I've tried adding AE in different tables without much luck.
The van goes okay but it...

I guess if I had my VE table really dialed in I could potentially run in open loop all the time...but it's not.
In my case in closed loop the PCM holds onto stoich for dear life and sometimes going...

It's hard to get my heavy van moving when closed loop wants to keep it at 14.7-1, early PE helps to take over where AE runs out and certainly makes my WB AFR's look better under moderate load.

You have the temperature for closed loop activation set very low for some reason and I'd reduce the time it takes for PE to kick in.

I've just started to have a look at your new bin, you have EGR still turned on?

With my 8626 PCM the Injector flow rate value is also used for the TunerPro MPG calculations.

My PCM has provision for a scalar to set the "Injector Flow Rate (TBI lb/hr)", I just input the new calculated value there.
This is not the most technical explanation but I've found if you just...

Do you have a photo of your external regulator setup?