Hi,

I just checked my calendar and it's not April Ist! We are in August 2020 where I live.
Coukd this be a lost in the virtual world posting? (:-)
You said this happened in November, so we are talking back a ways or way back that you were in San Diego.
Are now living there as your permanent residency?
If so are you staying on a salty beach front somewhere?

You are stating, Using it as a daily driver (?) and have exchanged the ignition components, three times! Now that might have you in August, even without a time machine!

I see no reason why the contacts in the distributor would getting so harmed, so regularly, unless you are washing down the engine with some sort of "corrosive cleaner" that is lingering under the hood waiting for heat! With an Acid or even an Alkaline base cleaner, the heat really makes it sizzle better with just moisture from the air!

I can't help but to say, This ignition trouble scenario, sounds like something from the playwrights of "Tales From the Far Side!"

This is a LH 2.0 fuel management system with a hall sensor that is a breaker-less ignition system. It might be just before or in transition of going into a LH 2.2 system. All the Bosch distribution components are brown in color but experimentation was in progress with Turbos!
Is this one or not?
There were some Chyrsler white distributors floating around so I don't know where you got that "white plastic look" inside the distributor unless you got a hold of a rotor button made like those white caps.
FYI, There are two different Bosch rotor buttons that fit the shafts of two different Bosch distributors.
Knowing Chyrsler, Volvo might have let them use aluminum terminals or aftermarket caps vendors got in the game?
I can say, I heard or read, that the Chyrsler caps were not greatest and the ICU box out under the hood, used a Chyrsler designed wiring harness to make things a wee bit bogus to troubleshoot. Don't mess with the terminal connections on that box and make the engine wiring harness a suspect of malfunctioning too!
The mid eighties cars has issues with the insulation bio degrading inside the looms!

When you said you had a 5 to 10% pedal issue back in November to San Diego, did you ever clear that to be using it as a daily driver, now?
What do you mean by splicing a fuel line? Aft of the main pump from the tank as everything else is pressurized? Got to be careful there!

You need to tell us more on what "gives" with this cars mileage and background maintenance.
How is the present day performance, otherwise?

Phil