I should say you are running really lean on startup.
Don`t forget you are spraying cold fuel straight in the cylinder, There is not enough time to evaporate and it should be extra rich to run smooth.
The engine doesn`t make enough power and wants to stall, drawing more unused air, making things worse, that`s why you are seeing 160 iac and high map and low rpm. The engine is fighting to run.
It gets a liitle better when the 02s start to climb.

Compare that with high humidity and possible weak spark not having enough energy to ignite the lean humid mixture.


Engine is not making enough power to stay running.

Maf doesn`t play at engine starting at all it is the crank VE table that matters.

And that 02s are like frozen they should be jumping like mad from rich to lean. There is something very bad happening there. Load the stock CL settings and see if there is some improvements.
If you still can`t dial the idle closed loop, I have a remedy called Open loop idle patch.

You should also investigate the controversial readings between narrowband 02s and wideband readings.