I bought some KYB GR2 Struts and Eibach ProKit springs, but now i'm reading that the drop of the Eibachs will stress the GR2 Struts.

Am I better off with the stock struts? Will the stock struts last longer?

Or should I be OK with my set-up?

 

That combo is fine. Eibachs are at about the limit of how far you'd want to go with KYBs. At least with AGXs- it's possible the GR-2s have a lower threshold for lowering, but since the needle valve mechanism in the AGX is what limits it, the GR2s may even be able to go lower than the AGX.