Thanks for all this information, it's awesome to be a part of a community that strives for solutions.
Before buying my BRZ, I was in the market for a 818c; which is also plagued by fuel starvation issues. One of the solutions they use to alleviate it is the use of the Holly Hydramat.
https://www.holley.com/products/fuel_systems/hydramat/
I've never personally used it, but the guys on the factory five forums have had good luck with it.
I wonder if this is something that could be adapted to run on the 86 platform?