7 wire turn signal switch problems?

[Phred]

I'm having challenges with the turn signals on the Coupe I'm working on. Here are the details:

6 volt positive ground system
$20 Everlasting universal aftermarket turnsignal switch (7 wire)
I have (4) #535 6v flasher relays, 3 prong (X, L, P)
Small incandescent bulbs for signal lights (bulbs are marked C55)

I believe the system is correctly wired and grounded as I can power each individual bulb through the wiring with a dedicated hot wire from the battery. Each bulb will light up brightly. I can then power the turn signal switch directly (no flasher) and LH, RH, and 4way functions work properly and brightly. This leads me to believe the switch is "switching" properly.

With flasher"A"installed, the 4ways flash brightly at once per second, LH & RH flash brightly at once per two seconds, as does the indicator light in the switch body. Things are functioning properly, except I would like the LH & RH signals to flash at a rate faster than every two seconds, so more flashes are visible to traffic.
With flasher "B" installed, the 4ways flash brightly once per second, the LH & RH do not light up at all, and the indicator light in the switch body does not light.
With flashers "C" and "D", the indicator light lights up dimly with nothing activated and goes off when turn signal is activated. When the 4way is activated the lights flash brightly at once per second with no indicator light. When LH or RH activated, there is no clicking of the relay, no lighting of the indicator light, and the signal lamp stays lit very dimly.

All the above is repeatable.

Obviously, flasher "A" is the best option, but what is causing all the other "stuff" with flashers "B", "C", and "D"?

If flasher "A" is a heavy duty type, would a "light" duty flasher increase the rate of flash? Does a light duty 6v flasher exist?

Are flashers B,C, and D malfunctioning? Are the C55 bulbs not drawing enough current to have the flasher at a faster rate?
Help.........
Thanks in advance, Fordbarn!