S3 wheel size vs handling

Hi looking for some help regarding wheels size vs handling.
2001 s3

currently on 19" wheels fronts are pzero rears are eage f1s near new condition
handling is amazing with this setup proper go kart handling actually struggle to screech the tyres.

other wheels I have are stock 17" on michelins pilot sport near wear limit
handling is pretty crapy on these feels a bit wolly and letting go abit.

Was told the stock size wheels is better handling capabilities but it doesn't feel it, or is it my tyres on the 17"
Are not as good? I think the pzeros are crap in the wet from what I read.
i want the best handling setup for the car both wet and dry if it means 4 new tyres on the 17s that's cool.

Could any one advice the best plan thanks.
btw I've not long owned the car and returning from the bike scene so pleases ignore my crap knowledge.

Hi,I would stay stock and choose a great tire. The engineers at Audi are all about performance, trust them! There are critical issues to consider , especially offset, and height. While you can get some great looks out of different wheels, performance will suffer. Good luck!

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Performance and handling is always better with 17's as less unsprung weight means the suspension can react more quickly and accurately keeping the tyre more in contact with the road .

What wheel width and tyre width of the 17's ?