Isn’t it 35%? Anyway this seems like a good advice but if you spend more than 35% time moving away from the range of their debuffs (which are autoattacks so they spam them all the time) then it’s not worth it. Besides, ranged builds are often inquisitor builds that use Storm Spread - shotgun than works best at melee range. You can also lose Censure’s range. Etc.
IMO best strategy is simple: kill the healers and facetank it. There are zero problems with aggro in this wave so no need to complicate it.