[Sever]

I would definatley drop 2 WIS and add it to INT. Your lore rating is not important if you pick up the Glasses of Identification when you meet Gaelin Bayle.

Your spells selections are up to you, but i would drop familiar (you can cast it from a scroll) and non-detection (it never seemed to come in handy for anything for me!)

A triple class PC will remain weaker than others due to the simultaneous levelling of three classes. Since your playing solo this will not matter one bit. Indeed, it is the easiest class combo to play solo with.