This one has been smeared on the bed. The nozzle is pretty much making contact, and the extruder skipped a few steps trying to cram plastic into the kapton. If you have an unheated acrylic bed, you are in for some serious scraping to get this off, and you may never get it all.
This is pretty flat, and will give you a little bit of a lip at the bottom. If you are having trouble with corners peeling up, you might try going this flat to get some extra stick. Be aware that it will make holes a bit smaller at one end, for one layer. If you don’t have a heated bed, this might be want you want to shoot for.
This is getting a bit too high. It would probably be fine for this part on a heated bed, but if it were tall and narrow with a small footprint, it would probably come unstuck. If it was maybe 100mm wide and flat, there could be warping at the corners.
This is too high. The thread is too round for very much plastic to be pressed down on the bed. When the extruder changes direction, it pulls the thread along with it, “cutting corners.” That is why the circles are misshapen, and if the straight lines were bumped into they would come loose and start flying around the bed. If you started this print and walked away, you would come back to a giant ball of plastic orbiting the bed on the end of the extruder.
Each of these changes represented about a quarter turn of the Z offset screw.