Let's see if I have these concepts right.

Nowadays, for most spells Force only determines the maximum number of hits you can get on the casting test, right? For Combat spells it determines the base damage of the spell, Area spells it determines the radius, but for say Invisability it only affects the maximum number of hits?

Regarding Invisability again, it seems to me that it just became much much harder to affect a camera (now OR 3? or 4?) with an invisability spell. Before all you had to do was cast the spell at force 4; now it seems you need 3-4 hits on the casting test as well? That sounds like it's gonna be tough to do reliably unless you've really been min/maxing your spellcasting dice pool.