Okay my new guess is moisture in the filament causing inconsistent extrusion, leading to the bubble on the surface. And also causing over extrusion.
For the walls, your picture is a bit too blurry/low res to really see, but I get the vibe of over extrusion with the small part that's sticking up in the center of the perimeters in the lower right. Also the top of the anchors for the supports looked over extruded, with plastic kinda curling up at the top.
Your new print is now definitely under extruded with those gaps on the top surface.
I think flow rate is not the culprit here. Your bridges on the first print are also extremely suspicious. They should be solid lines, not the blobs you're getting. Something is wrong with the flow of filament out of the nozzle. Could be moisture or temperature or issues with the extruder. It's hard to tell.
As a separate note, you definitely want to do testing/tuning with ironing disabled. It will hide a lot of the features/defects that you are trying to observe/tune away.
Once things are working you can then tune the ironing