correct
but here is a better way to explain it..
there are only 4 base levels for reapers .. levels 1/11/21/31 ...
example 1.
take a level 6 quest ... it may have a number of monsters from level 4 to 6.. when you run it on hard, it scales them all up 1 level.. or elite or reaper up 2 base levels. (this type of scaling is more like.. insted of the mob hitting for 10, it hits for 12 or insted of 100 hp it has 120.. or a save of 5 becomes 6)... but in the case of reapers scaling is quite a bit harder.. it takes a base tier 1 reaper and scales it directly to level 8.. resulting in a much harder mob becasue its a factoral scale from level 1 vs a regular mob that is a specific level already bumped to a higher level.
example 2.
now take a level 9 quest.. scaled to reaper now becomes level 11... again you scale level 7, 8, and 9 mobs to level 11.. without problem ..
but as i said before .. becasue there are only 4 base levels for reapers.. your no longer scaling a tier 1 reaper to level 11.. but starting with a tier 2 reaper directly in a level 11 quest... that is also the same base reaper in a level 14, 16 or 18 quest ..
this makes those base levels MUCH harder in respect to reapers..
thus, as a general rule, I run quests level 4-8 on R10 .. 9's and 10's on R4 .. then back to R10 for 11's-18's .. back to R4 for 19's-23's and r10 for 24+
"trash/normal" mobs in quests appear at the exact same spot and qty on every difficulty above normal, half the number on solo
so a quest with 100 mobs on normal will have exactly 100 mobs on hard, elite or reaper.. but 50 on solo .. every mob will appear in the same position.
the only exception for reaper mode is .. a few reapers will spawn outside of the normal trash spawns .. (so if there is a room where trash spawns .. you may see a lone reaper before the trash spawns)
the other exception is in slayer/wilderness zones .. thunderholdem, orchard, barovia .. etc ..
the number of mobs/lag will increase in direct correlation to the number of people in the group/raid .. IE .. soloing the orchard will yield about 500 mobs.. but with a full group there are about 2000
mercs don’t count as people.