(I skipped pg 3,4,and 5 due to discussions at that point in time)
The issue of OEM injector sizing can be variable with the particular vehicle design. We never really know what particular design specs the OEM engineers used, OR if they had to downsize to a lesser-size injector to meet "Accounting" needs on the "end of the assembly line" vehicle production cost. So, to me, NO universal statement can be made of "what works" on a particular vehicle or all vehicles. Adding some additional fuel pressure (via fuel regulator adjustments, which also have their limits) is a Band-Aid fix at best, to me.
By observation, LOTS of things blow up at race tracks. Mis-guided "upgrades", poorly-executed "upgrades", or trying to make something work that "somebody" said would work or had worked for them . . . it's all in the mix.
When "alcohol" classes were added at some dirt tracks (DFW area)in the 1990s, some racers discovered that they could just take the jets out of the Holley 4bbls they were running (4150s or similar) and then just worry about keeping it running at "idle" speeds. My machine shop operative called it "controlled flood". They had to do an oil change after each race due to fuel dilution.
To me, better to build an engine capable and durable on E85 rather than seek to convert an existing gasoline engine to run on E85.
GM built scads of Suburbans/Tahoes that were E85-capable, back then. No outside badging, just a "hang tag" on the inside rear view mirror. Lots of 4-cyl S-10s, too (whose owners didn't know what they'd bought until fuel filter replacement, which also contained the fuel sensor, at $90.00 for the part). This was the later 1990s when GWBush administration had the "flex-fuel factor" in the fuel economy ratings, such that such vehicles received "mileage credits" to keep the CAFE up to specs . . . in the middle-late 1990s. At that time, in DFW, E85 had very LOW availability and most purchasers didn't know what flex-fuel meant.
As other OEMs were cautioning against using anything other than E10 in their vehicles, GM quietly started building E85 vehicles as "standard equipment" . . . look for the Yellow gas cap! That was about the 2012 model year? Not to make GM look good on this, just to mention it for informational purposes. On these later vehicles, GM uses the oxy sensor to determine the E-concentration as a virtual fuel type sensor of sorts.
BUT, for a carbureted engine, things are MUCH different! Engines and fuel systems need to be much more "purpose-built" to use either E10-15 or E85 efficiently, which can be done. Only thing is that to do it "E85" means you'd need another carburetor if you were going to go cross-country in the same vehicle. Some sort of detonation limited would also be needed, I suspect.
Happy Holidays!
CBODY67