well technically it is leaking more at high rpms it is just that instead of your wastegate bleeding the boost your leak is and you dont realize it. The reason you are boosting up high now is because at lower rpms your car is not making enough boost to compensate for the leak and it takes until high rpms to reach the point were boost is being bleed by the wastegate.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.