I don't know it this is at all relevant or not .... but .... back in the
early '90s my '84 wasserboxer would start and run fine if started from
cold.  It would also start fine after running for a time if I killed the
engine and restarted it right away.  However, if I killed the engine and
didn't try to restart it for 10 or so minutes, it wouldn't start and was
obviously flooded.  I would have to wait for several hours before it
would start normally again.

To cut a long trouble shooting story short, the problem turned out to be
a bad fuel pressure regulator.  It had a pin hole in the diaphragm.
Replacing it with a new one completely cured the "flooding".

A few years later, my '85 wasserboxer developed the exact same symptoms
and I thought, "Ahah!"  I didn't even trouble shoot.  I just replaced
the fuel pressure regulator and that was indeed the problem.

I guess the point is ... more than one thing can cause flooding symptoms.

Mike