I don't think the front is affecting the rear traction. I agree with the comment, that it might be taking a while to scrub in your new tires.
I used to race motorcycles and spent a good chunk of a season running Dunlops on the front and Michelins on the back. I'd have no problem mixing brands as long as they are both about as sticky.
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2003 Boxster S
1995 Ferrari F355 Spider
San Francisco, CA
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