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I am familiar with scrub radius, but I do not see why you are so concerned about it... Assuming it's the same on both sides, it usually does not adversely effect handling.
Wider, aggressive tread tires are notorious for wandering a little, especially "tracking" ruts in pavement, etc. That's a small price to pay for the better handling of wider tires, and the effect is usually nominal. It sounds like your alignment is way off, either caster, camber, or toe being "off" (maybe set ideal for racing, but poorly for street manners) could allow the front to feel like it wanders.
Overall, your 911 has a suspension setup that many of us strive to acheive. Yes, there are some prices you pay for ultimate performance. But what you're describing doesn't sound right. Harsh ride, common; wandering, something's not right. I would start with an alignment. I wouldn't suspect the larger tires just yet.
Colby
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