Eibach is 10% firmer than m-sport springs and even more(%diff) from base springs, since base springs are even softer.
I suspect you are now over sprung, high spring rate with OEM base dampers(slow compression/rebound), causing bounciness.
Koni would eliminate the bounce because its comp/reb is more appropriately matched with a higher spring rate. You should have a firm but compliant ride overall, without the bounce.
Koni Sport yellow are firmer and rebound adjustable, more performance oriented. Special Active red are non adjustable, slightly cheaper and sporty/street oriented. Either choice is fine and will improve the bouncy ride you have now.
Last I checked Koni are 20% off
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