Judging by your healing numbers versus my WHM's healing numbers and your max HP I deduced you are at least i250+ item level (my i260 Medica II with DS is 860-930 regen while yours was 790-860 and my HP is only about 1k more than yours at 20k). So you are at least 35-40 item levels above the minimum for that dungeon since it is set to i210. The rest of your group based on HP seems the same at least i250+ (minus the WAR which I can deduce was around i240-i245 based on my WAR's current HP at i250)
If you actually want to do a test on how much healing this dungeon was TUNED for you have to go in with a full party of i210 (as in every single member is only i210). It is tuned with that as a possibility so without doing that then you don't really know the actual healing requirements. The healing requirements are low because everyone in your group is extremely over geared for it.
