Slotting it doesn't do anything. No change to max HP or end.
The Panacea proc's in-game description says it heals a little more and gives an "infusion of endurance." I don't think it's supposed to change max HP or max endurance.
Based on the experiment I ran on test last night with one of those, that would be a proper assessment.
When the proc fired, it didn't bump max HP, it just added to the amount of HP healed. I wasn't paying attention to the Endurance bar at the time, so can't speak specifically to that aspect.
Correct. As here (http://paragonwiki.com/wiki/Panacea:_Chance_for_%2BHit_Points/Endurance), it's a small heal plus a small endurance dump in PVE, and a small +regen plus a small endurance dump in PVP. It has nothing to do with maxhp or maxend.
I see where the problem lies. It doesn't say "Chance for" like the others do. That is something that needs to be fixed.