"Pulsing" voltage, RPM drop with load.

Hey guys. I have a 72 SBM (b-body) with electronic ignition an I am trying to track down the source of a nagging electrical nuisance. The car is charging properly (14+ volts) however I can see the ammeter gauge pulsing as I use turn signals, wipers, lights, etc. and the voltage drops as I add more. This is ONLY when I am stopped and gets down to about 11v. Headlights get fairly dim at stop.
Been going on for a few years and I am trying to eliminate. Today I did a pseudo mad bypass by running a wire and fuse link to the battery relay from the alt output. Ammeter is still hooked up but obviously not functioning fully however I have a voltmeter and still have the pulsing. I also cleaned my engine, core support, regulator, ign module grounds.
Over the years I have upgraded my ign module, volt regulator and alternator (stock output) to update and none have had any effect. The other thing I notice is that I can see and hear a slight (100 rpm) drop when I turn my headlights on at high idle.
Admittedly I am no electrical expert so any advice is appreciated.