Right know at lvl 6 naked i have a 40 endurance gap with Eder, but it has not been problematic. Plus i have an enchantment +1 Con on my chest and a chain +15 endurance, and if i know i'm going through a dungeon i make sure to rest somwhere that gives me an extra bonus to Con and bring the proper type of food. I use him as an off-tank with a two-hander, but if i'm being swarmed i just switch to a one hand with Draining, since i don't have the natural regen of a fighter, and shield. 3 Con is bad at the very beginning, but the paladin's Faith and Conviction and high Perc and Res give me plenty of defenses, especially deflection. Been toggling between hard and medium, nothing extreme.