Nice shot lederhosen!
For me, perfect conditions are same place as you, same hour time (sunset) but not this calm sea!
It makes a huge difference in detection when sea is at least 7 m/s...
Each time i wait all stopped periscope depth ahead of convoy with same sea as your screen shot, I’m always detected by escorts and have to run away
Now i shadow the convoy until weather change for bad sea
With latest update, the weather change very fast here.