I can confirm your observations. In level flight at 80 - 90 knots the real UH-1 actually needs some right pedal, not left pedal.
Alexander “PilotMi8” Podvoyskiy himself experienced that when he had the opportunity to fly a real Huey at the Dillon Aero company in Arizona.
In the past the DCS Huey had always been neutral in the pedals at level flight (without wind effects).
Which I could live with. But I am fairly sure that in the past the trimball at least stayed in the centre position in such a flight situation.
At the moment complying with the trimball at level flight leads to a crab flight.
ED really should look into the trimball behavior - there is something wrong with it.