Evocation, like all magic, is an effort of will and imagination. Most Evocations are willing, say, a bolt of fire to leap from your hand in a direction, and can thus be dodged...but if you are willing someone's heart to fill with ice, and they move, your eye kinda follows them automatically, and your will and imagination are gonna continue focusing on them, not on an empty space they occupied, so moving's not gonna be helpful unless they break line of sight (which I talk about above, and would work for similar non-Athletics targeting powers like many versions of Incite Emotion).
I would still argue, that the effect needs to travel from you to the target, even if it isn't visible during that time. And once the effect has left you, you can't control where it is going anymore, it is working on it's own. And since it isn't thaumaturgy, the spell can't adjust his trajectory, because it doesn't know where it is supposed to go.
"I throw a fireball" and "I fill his lungs with water" are both the same kind of attack spell to me, it's just different narrative. If the spells only inflict stress, his jacket might catch on fire for a split second, or he has to spit a mouth full of water out, but that's pretty much it. I know how players always try to do the most effective "kill him with one attack" sort of spell, and in an open magic system like this, you can justify it pretty well. But on the other hand, treating every attack spell the same cancels that out pretty nice. And just because you plan on doing something that could kill someone in one strike doesn't mean you will be able to do so in the heat of battle.
As for mental spells. I am kind of fine with them by now. Provided they stay within mental conflicts. I would not let a WCV use his mental whammies in a physical fight, so I would not allow mental spells in aa physical fight. But if you can justify switching the venue, I will gladly oblige.
Of course, the wizards personal preferences of using his magic should also be considered. Molly would probably be able to put up a mental spell pretty quick, while Harry might need a willing target, or at least one that doesn't protest too much. Their physical spells are quite the opposite, of course.
The sex appeal stunt is great for attacks. Being taken out in a mental or social conflict by the sex appeal stunt is definitely a possibility, so I don't see a problem with making attacks with it. I guess the mental and social attack stunts grant more bang for the buck, because most groups will tend to have more physical than social and mental conflicts combined. So to give people an incentive to take some of the mental stunts, they overpowered them a bit.