Hi
Best not to use the hanging angle for the truss as this does indeed cause this problem if the truss is converted to a Light Position... The instruments will pick up the Z value of the light position,
Instead, you need to leave the Truss with a hanging angle of 0. Convert to Light Position and then run Spotlight/Visualization/Create Plot and Model view. This creates two design layer viewports, on different layers, of the Light Position - one of which you can rotate to be angled as you want, the other can be used to display the Top/Plan view.
Then, create approprite sheet layers with Viewports to display the design layers (and their design layer viewports) as appropriate.
Hope that gets you started. Try running the command on a single light position in a blank file, to get your head around what the command is doing.