I didn't have too much trouble on my no summons run with the Godskins until I encountered their spirit versions in the Spiritcaller Cave. These were immune to the bleeds I was using and I couldn't get them to stagger, and though they don't appear at the same time I did too little damage so they would beat me by attrition. There also aren't any pillars to abuse, either, so I had to learn to roll in sync to the fat one's rolls. It also sucks to have to run through all those annoying wolves, snails, and the katana guy every time you die just to get to them. Eventually I got tired doing it the "fair" way and just fired sleep darts at them which made the fight a lot easier.