I had a similar question.
I’m doing weighted hill climbs for ME.
Last week: 550m (~1800 feet) carrying 18% bodyweight. No DOMS next day.
Yesterday: 550m (~1800 feet) carrying 24% bodyweight. No DOMS today.
I’m conscious that the recommendation is not to increase weight carried beyond 30% of bodyweight. That leaves my choices as increasing the duration of the workout or the steepness of the hill. Latter is tricky; route I’ve been using ascends 550m in ~1.8km and is the steepest available. Curious as to what others would suggest.