I think we need to realize that blizzard has developed a way of detecting bots that is not based on warden. I know the buddy devs are excellent coders and are skilled at circumventing warden, so i don't think that warden is the problem. There has to be something new.
sarkoth isn't instaban. I use AGB sarkoth and run it for a few hours at random times. Running it 24/7 will likely net a ban eventually but definitely not instantly. I still think NM Core is the best gf spot and will probably remain so. ajw has a pretty solid COA profile found here...
what is your attack/loot radius? I had this happen using another bot and it was solved by reducing attack radius to 20. Essentually the bot was trying(and failing) to attack a hidden object out in the lava.