I am concerned that my previous misrepresentations will adversely affect my current permanent residence case. There appears to be no doubt that you made misrepresentations to the consular officer. It also sounds like you did not retract your statements. Your best option is to try arguing that they were not material. This is because immigrant waivers for misrepresentation are very difficult to obtain.
Extreme hardship is a very high threshold to meet.
A finding of inadmissibility turns on whether the misrepresentation was of direct and objective significance to the proper resolution of the alien's application for a visa. However, your comments may still be considered material if they tended to shut off a line of inquiry that is relevant to your eligibility and which might have resulted in a proper determination that you be excluded. Here, the consular officer denied your application for a visitor visa even though he believed your misrepresentations. Even if he had discovered that you had made misrepresentations, it would not have changed his decision to deny your application. Under these circumstances, your previous misrepresentations should not be considered material.