Can't comment on the tyres you mention. I have Nexan 3000s on my Ibiza and can't fault them nor the Kuhmo SPTs on my A3.
I commend you for retaining 15s, IMO going bigger spoils the ride and handling.
Putting 16s on my A3 to go over the big brakes knocked the acceleration noticeably. Had to do it though to control the power I am after.
Cheers
Gavin
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