you can try turning your fuel pressure up
Not sure that can be done with a factory fuel pump, can it? Which, btw, is only putting out 10 psi. That seems awfully low IMO.
Here's a tangent for everyone: I used to have a kerosene fired torpedo heater. It was a very simple machine. Fuel source, ignition source, fan for air, and it was controlled by a small circuit board (I'm guessing it had a microprocessor).
My point? That thing NEVER worked right. It was always spitting and sputtering. Sometimes it would flat out stall, and oh man did that thing STINK.
I was always cleaning out the fuel filter on that thing - and that would make it run ok for a few hours, but went right back to the spitting and sputtering as soon as the fuel filter clogged back up.
I'm trying to relate that experience to the symptoms with this current POS small block.