Most outdoor HLGs will have a few degrees of wing incidence.
Only calm weather and indoor models are likely to be set up without incidence (0-0).
If you check your models wing incidence and find that the first (red) and second line (green) coincide then either re-position the tail or bend in some up elevator.
If you find that the second mark (green) is below the first (red), then you must re-position the tailplane so that the green line is above the red line.
If you are using a pop-up boom d/t (Hybrid) then ajustment may be made by packing the front of the boom or fitting a screw for ajustment (Butterfly). Use this incidence gauge to tune your models performance, by increasing or decreasing the amount of incidence.