Wily
It is your visual association with the ground that is subconsciously messing up your circuits.
The downwind turn thing is easily put to bed.
ASW helicopters spend a lot of time flying in circles at low level (200ft and below)
The proof that this is a perceived and pilot induced issue is that on many occasions I have been pinging away in total darkness/IMC, carrying out orbits/circuits at 100kts in 40kts of wind at 200ft and below.
No problem until the sun comes up, and then suddenly it all feels uncomfortable on the downwind turn. Your mind overides what the instruments are telling you because the visual system is so strong.
The fact that when all you can see are flight instruments everything feels exactly the same as a zero wind day and your powers are steady is difficult to reconcile with the visual skidding over the ground and groundspeed changes etc.
You fly relative to the air, not the ground.
The only time the ground speed is of any relevance is at the moment you touch it.
Incidentally, you are venturing into the silly with the rotorblade thing. retire gracefully with some credibility.