Calibration Curve

Im currently running a method for the IC where the calibration curve has to yield a minimum of 99.9% Coefficient for all of the anions of interest. However I just had a PM visit on my instrument and the results im receiving is 99.7% and 99.5&. I believe the the current method that is in place needs to be update to have a range accepted especially since the Check standards have tolerence yield between 45-55 ppb. Can anyone give me any insight with this or let me know if Im going in the right direction? thank you