The spark plugs show the front carb was clearly flooding.
Dirt in needle seat/fuel pressure/ float setting fuel filter.
Those plugs are now carbon fouled and will not clean up.
You will not be able to further tune , using these now carbon fouled plugs.
They are all now history.
Replace all the spark plugs with new. try again. You cannot tune with fouled spark plugs.
re: secondary air doors...
You are a long way away from playing with the air air door weights.
One thing at a time.
( when if you do get there you will need two spare air doors to work with as it is easier to get it wrong then right and takes work. adding/subtracting weight.. Don't jump ahead.
Get new plugs and get some more driving afr tests.
get the timing sorted out. starting with the idle timing.
Do not allow the engine to idle slow, when it is cold.