The player base asked for warlock nerfs, monk nerfs, and for nerfs to broken multiclass builds including AoN builds, and received corresponding nerfs to the multiclass warlock tree, multiclass monk tree, and AoN/vkf versatility. So, uh, what you are experiencing is exactly how they wanted a build like this to work.
I never tried Vistani with daggers. It may be better for heroic leveling now.