Rune farming

I have character that is level 532 with 80 vig 70 mind 62 endurance 80 strength,dex,int,faith,arcane. I play on ng+7 i gain levels by farming in mogh with the sacred relic sword. But it really slow. It takes me about 6 minutes to gain one level and that with rune buffs and everything. And it takes more time to farm for golden foul feet. So my question is us their a faster way to farm, we have an whole dlc i figure their could be a faster farm in their instead. Also side question how do you find more golden horns. You cant craft them and i been farming for an hour and i have 5 more. If i did an hour of foul feet farming i would have 50+. I know the horns are better but at this point im just gonna farm foul feet. Thanks for any help