Is your heli raked? Meaning, is your boom unlevel to the table when you set the heli down because the skids make the front end lower? If your heli is raked then of course your pitch values will be different when your blades are in different positions.

My Oxy helis are raked so I must deal with this every time, but it’s easy.

First zero your pitch gauge to the boom. This is important! Then when checking zero degrees blades at 0 pitch channel, make sure the pitch gauge is oriented in the same way as it was when you zeroed it. So if the digital readout of your level is on the port side of the heli when you zero it against the boom, the digital readout must again be on the port side.

^ Hope those picture helped. Is your heli raked? If so all blade pitch measurements must be done relative to a surface that is perpendicular to the main shaft. For a raked heli, the table surface will not work since the table is not perpendicular to the main shaft.

But the boom should be perpendicular to the main shaft. That is why it’s a good place to zero your pitch gauge there.