Handling with eibach sportline vs pro kit on Civic Si

[BoostedDreams]

Hey all, looking to lower my Si with some eibachs since we have a limited option (unless swift comes through with a release soon). I would prefer to go a little lower with the sportlines and am wondering does the extra drop have a positive effect on handling or is it strictly aesthetic? I definitely want to improve the handling of the car and increase the cornering abilities. I do plan to occasionally track it however it is a daily driver.
Also, would adding 15-20mm spacers upset the balance?

Thanks!

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