Ok, so the flap you outlined is perforated up top. I moved it back and forth a few times to un-stick it from facing straight down and out some.
I haven't tried a large piece yet, just the quick-settings and Ultimaker robot, which turned out alright (a little droop on the top of the robot chest seems normal). Is there some test print models you can share that would help calibrate? Test cubes/squares I have seen others print out? I'd just like to use a reference everyone knows well, then I can post photos of my results. It would be helpful to know what settings you would advise (0.1 , etc)
The only thing I can think of is.... I did increase the retraction slightly by 0.2 a few weeks But asides that, I have been trying to print at 30-40 mm/sec (for good details) at 200-205. Too cold?