One more thought on tyres & the 185/60 option: given your remarks about wet avoidance, why not a road friendly "track-day" style tyre? Of the few availablein this size, I'd choose Bridgestone's RE71R.
https://www.bridgestonetyres.com.au/potenza-motorsport-re-71r
https://www.bridgestonetyres.com.au/potenza-motorsport-re-71r