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MrScratch -- be sure to read up on the physics of our rear engined cars - i.e. how weight-shift from braking/acceleration can have a unique effect. The easiest way to get into trouble is to enter a turn too fast, suffer understeer and then hit the brakes to slow down. Doing this will transfer grip away from the rear tires to the front and cause the rear end to swing around like a pendulum. "Slow in, fast out" (drive into a turn slower than you think you could and accelerate through the turn) is a good mantra to follow. Also, strongly suggest that you get some autocross experience and/or a PCA driver's ed/track day program or 3 under your belt to help fully understand the unique handling traits of our 911s.
Also, what size tires did you end up going with? you mention 215 width tires up front? 205/55-16 is the stock width for front tires, if you have 215s up front keep an eye on their sidewalls for evidence of scuffing on the inner front fender lips and roll your inner front fender lips as soon as you see any evidence of scuffing to avoid damage to both your new tires and the fender lips/paint
Finally, keep in mind that new tires generally require 5-600 miles of use before the greasy coating applied during manufacture to allow the tires to release from their mold wears off. Suspect you'll find your tires' performance to improve significantly as they break in.
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