I see some changes when editing the file in the documents DayZ. In C:\Users\*YourUser*\Documents\DayZ (documents on PC). Open: *YourUser*_settings.DayZProfile. Change SceneComplexity line over 1000000. Like 1200000, 1400000 or more. Save the file.
Open game and check changes. If nothing changed leave game and look for SceneComplexity line, if it changed back -> edit again SceneComplexity line to your vaule (*should be the first step*), open properties of this file and look for "Read Only" and check the box, apply changes, after it game cant change this file, but you cant change some settings in game to. Check this post to Edit LOD Distance