Thanks for the reply.

Have a green cold start and a tan one.

I tested both by hooking to the fuel distributor (cold start line turned around to feed cold start facing up) and activating the fuel pump, and both produced cone-shaped very finely atomized spray.

I looked down into the rubber hose the start injector sprays into and it looked fouled with rubber shavings, so removed the hose (leads from intake manifold to aux air valve)
and trimmed out all of the rubber bits so the inside is clean, but haven't tried the car again yet, but I suspect it's more than just that.

The plugs are clean of any fouling, so hopefully it's not guide deals. The hard start vs easy start is night-and-day and can be horrible one start and great the next, so I don't know.

Getting the spray into the manifold all depends upon air flowing through the aux valve past the cold start and into the intake, so if the aux valve isn't sometimes opening enough I was thinking maybe the engine isn't "inhaling" the droplets of fuel.