I still see filmmakers struggling with exposure shooting HLG with their GH5. In order to get consistent results, be sure to set your zebras at 90% – this should help avoid clipping of the red channel. Next, using a white balance card like the X-Rite ColorChecker, reduce exposure just until the zebras disappear. You should not need to lift shadows in post, which will only introduce noise in your shots. The following are screen grabs with the Leeming LUT v.502 applied, no color correction in post.