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I'd say you have too much spring rate for the tyre. The monosport are 9kg rear and 8kg front (I was looking at them myself) and on top of that you have thicker stabilizer bars which would make the issue worse.
Since your in Spain i'd say try a semi slick like toyo 888's or Michelin pilot sport cup 2 (my choice) in 215/45 R17 on stock rims. They should work better with those high spring rates and stabilizer bars.
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