Yea Butter Rugs are the shit you need... I mean I had the Wax paper underneath my slipmats for a while, but when u get down to it... Butter Rugs are the perfect texture of slipmat with slippery paper underneath... They're the best...
As far as EQ... There are no rules... Depending on the effect you're going for your gonna have to EQ differently... If you're going for a loud Transformer you may need to boost your mid range to give it a robot effect... If your just scratzhing words from an acapella you may opt to leave that shit completely dry as far as EQ... Never limit yourself to one setting for every scratch cause there isn't one setting.
"I Who have Nothing but the Comfort of my Sins..."
--- Vinnie Paz