Except for the agressive part, I would say we are at about the same point looking for lessons. The last few years I looked for semi privates or privates only and asked up front for a level 3 instructor or examiner. I would go to the SSD and make my request known. I would also talk to them before you arrive and try to make sure they have a chance to team you up with an instructor that will fit the bill. Be open minded beyond that. If you have a chance to get some buddies together that are about at the same level you are, you can get semiprivates usually close to the same price as a group lesson (depending on the price structure of the Ski School and how many friends you can put together)
It's a great way to ski with your buddies and still get a great lesson.
If things are not going the way you expect, don't be afraid to talk to the instructor and let him/her know your concerns. Sometimes it's just a misunderstanding and any good instructor will try to make it right.
and if you get a great lesson, don't forget to tip accordingly.
You are the customer. by all means ask. Every ski school I have worked with, when asked up front for these specifics, have done everything they could to make sure I got a good lesson.