I managed to beat the duo hobgobs before the boss of Forest of something dungeon (the same main dungeon when the hob gobs quest appears). I grinded a bit trying to level my weapons to get passives. Notable passives against the hob gobs is the anti demi human 40% (need to kill all goblins in the sniping mini game, so you might have missed this, gives goblin slayer weapon), Poison immunity, Blind immunity (BLIND SUCKS), either get them from inherited passives (best case scenario) or accessory. The forest boss is lvl 40. The duo hob gobs are lvl 45. I beat them at level 47 (since I've grinded my weapons farming for proficiency and mats in the forest) and THEY STILL HIT HARD 900-1500 damage per hit at 12k hp. Focus on parry, when one of them is broken combo them, repeat and spam heals if possible. 10k hp with the red potion = 4k hp heal. Are you on gamer difficulty (or possibly higher?) I played on gamer difficulty. Higher difficulties than gamer have TIGHTER parry windows.
They give a GOOD QUEST REWARD so finish it as soon as possible if you can.