That drastic voltage reduction while cranking is one of my suspects.
As far as the Pertronix being the fault, if the coil current is so low (due to 8 volts) it dont matter if the switch is elec (assuming it still switches) or points, the spark will still be weak. At 12 volts a 3 ohm coil draws 4 amps while if only 8 coil current drops to 8/3 and you have a weak spark when you really need it for starting. Of course at atmospheric pressure its easier to arc jump the plugs gap versus if at 100 PSI.
I dont think low RPM is a problem with the pertronix, I think they trigger the switch by the Hall Effect so it dont matter if the magnet is going slowly past the pickup. I dont know if theres a low voltage threshold as far as bias and allowng the switch to trigger BUT I SORTA DOUBT IT
You and I know its the switches CURRENT RATING that Pertronix doesnt want exceeded so thats why they advise the 3 ohm coil so Billy Bob and his know it all brother in law arent advised to use a 6 volt coil plus ballast knowing they will mess up and cause the switches curent to be doubled which can fry it........OF COURSE a 1.5 ballast plus a 1.5 coil makes the switching current the same so a switch rated for 4 amps will work butttttttt they just dont want us to do that knowing Billy Bob will screw it all up lol
Id work on that voltage drop........00 Gauge cables,,,,,,,,,good ground near or on the starter,,,,,,,,,good heavy battery etc. BUT YOU KNOW ALL THAT ALREADY
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