Originally Posted by Hajile
Have you even checked if your blades are physically 0 degrees when the TX is at 0 pitch? I noticed that if i press main gear as far as it'll go, it ends up lowering the rotor head, and consequently, the swashplate ends up a millimeter higher up the shaft. Which in turn raises the pitch angle. I had to use the subtrims to lower the pitch back to zero.
If i had left it as is, there would have been a bias towards the positive pitch and the excess angle taken from the negative pitch,
You might want to check the collar on the main shaft, sometimes it slips up which adds a lot of vertical play in the shaft. I don't know how much play mine has but it's very slight, maybe 0.5mm or less.
Your comment reminded me to mention that it's important to level your swash and as part of that make sure the blades are at zero pitch when the stick is centered. From the factory mine had a large bias towards positive pitch which could also cause poor inverted performance.