Just from my own perspective. I no longer bother with heavy armour, which requires agility potions to be reliably effective, otherwise there are too many missed strikes for my liking, but it does give greater protection.
I prefer to concentrate on Erevi, daughter and familiars routes to get the crown of sorcery, nothing can stand against a lightening strike, combined with a crystalised egg, when equipped with the crown, especially when the familiar is at a high enough level as well.
Even the master fell in double quick time when so equipped.