The Fuzz, hello for Arkansas, south central USA. I looked at your pics, specifically the entrance. I like what I saw!! I don?t see any big problem. The entrance looks about 5/16 inch tall, ok that will work but I would make a bit taller:NOT 3 times taller., thickness of a wood pencil lead taller. The height of a bee plus a pencil lead thickness taller, same as 3/8 inch. I think you us metric is why I state common objects such as grapes, honey bee, pencil lead jus to give a general idea for height. You do not want the bees wings or back to touch the top of the entrance: that is the limiting factor.
My screens on some hives get propolis over so no air flows. Other hives leave the screens alone and do not close with propolis. Go figure??
I use 3/4 inch entrance reducers [size of a grape] during cold season, 4 inch opening as warmer weather permits, finally full open entrance when 90F and above to make it easier on the bees to cure the nectar which is mostly water. Full entrance on a strong hive only. Weak hives, newly created, always have reducers on the entrance, regardless of weather.
Cheers Mate
Van