Good info right there ^All P2000SK pistols use the same recoil spring assembly regardless of caliber, the spring is always painted red although it wears/flakes off rather quickly. There is only a single part identification number for the P2000SK recoil spring assembly for the 9mm, .40S&W, and .357SIG (#207119).
Strong positive ejection is not a flaw in a service pistol, it is in fact a desired trait.
With the p2ksk using a universal assembly for 9mm,.40/357sig along with it being a low mass slide it's going to sling it regardless IMO. Don't be disapointed when you put a new assembly in and don't notice any immediate difference, not to say you won't but I'm putting my money on no difference if so very minimal.