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I posted this in the rules forum because this spell should be combat applicable and no guidelines are present. On top of this, I see no rules in place for concentration checks for spells already active since the guides only account for during casting. I then posted what I did as a model. There was no home-brewing where this was used it merely was not an official pathfinder society session.
The rules forum is specifically for the actual rules of the game. This is very much a home-brewed rule, as it does not appear in the actual rules of the game.
You may also be overlooking that is is a standard action to maintain a spell with a duration of concentration.
Concentration: The spell lasts as long as you concentrate on it. Concentrating to maintain a spell is a standard action that does not provoke attacks of opportunity. Anything that could break your concentration when casting a spell can also break your concentration while you're maintaining one, causing the spell to end.
You can't really do anything if you are concentrating on a spell except move. Especially since you have to concentrate for at least 3 whole rounds to get the surface thoughts. That is a massive waste of actions. You are just standing there - any even remotely intelligent creature would just ignore you, making the defensive abilities pointless.
Aside from that, nothing about the actual spell scales with your level. There is no reason to make any defensive bonuses scale either. You aren't looking deeper into someones mind or getting the results faster as your level increases, it stays the same from 3rd level to 20th. The same should apply to any defensive abilities you want to give it.