I might have over-estimated secret dungeon hell mode, I thought I was gonna do like 2-3 digit damage. When I tried it out solo, I was doing 6k and 9k crits to mobs. So with a good dedicated party those secret dg equipment is certainly easily attainable.
Here's what I got on my run, I decided to suicide on 2nd map since its wasting my pots.
(lookie 4 of that purple thingy
Chance to get materials for dual stat gems are high. Now I just need a team near my level (47) to farm for secret dungeon keys and go on runs with me.