Yes Agi+Wis is very powerful - you get both the heal crit increase PLUS ritual - the result is stupendous actually. I mean what does my sacrificial heal ritualised and critted look like? Thats one mother of a heal
Add to that ritualised cannabalise/force cannablise etc. Then you have the other boosts etc... I am personally Agi-Int but I plan to move from the Int line because I dont think Ill be soloing much for which the INT line really is great. Raiders really should be going down Str/Wis, Agi/Wis or Agi/Int.