Leave Raithwalls Tomb & go level up to level 28 or so & get more quickenings. Don't bother fighting the 1st demon wall he is optional. If the quickening strategy isn't working try just attacking it alot first & cure when needed then when he is 1/2 health quickening his stony a$$. Its best to get into the attacking strategy very quickly I learned the hard way against one of the hunts quickenings should never be your first plan of attack but they are great for finishing a fight.

Your probably wondering why did I suggest eh quickening strategy then? Up until the end of Raithwalls tomb it was my boss fight strategy (SPOILER)& if I remember it even worked on Judge Ghis