Most likely toe. When under heavy braking the car squats and the weight transfers to the front tires causing toe out. If you are running square NT-01s you can really put the car on it's nose and go significantly toe-out.
Two choices:
1. Re-align and increase your toe-in F/R to eliminate the wiggle under heavy braking.
2. Adapt your driving style a bit. As you enter a heavy braking zone, squeeze the brakes a bit earlier > allow for weight transfer > go full braking >then ease out of the brakes keeping the car totally settled as you turn-in.
Both methods work, #2 tends to be quicker over time.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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