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I'm going to guess the track day guys are running with NASA - they are probably either doing HPDE (which is non-competitive, no "need" to spring for a bigger/pricier tire) or they're doing TT in which case the points system will assign points for going over a certain size tire.
All other things being equal, I don't know anyone who would turn down an extra 20mm of tire. The extra grip more than outweighs the miniscule weight addition (we're talking a couple pounds here).
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