This is not a common problem with slotted rotors .
Both Mario and Lemo are not running pads recommended for the rotors both opted for oem pads here in my opinion could be part of the cause
I am running the Delio`s pads and rotors and have done so for 15000 k with many a interstate trip , towing , stop start city trip and off road venture all with out issue or the same fault .
The brake tests you so want are not with in reach of the common man to prove except by seat of the pant`s dyno which in my opinion is very noticeable .
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