750SS porpoising

I just bought a 93 & 94 750SS. Although they are a pretty matched pair the 93 wants to propoise a little at full throttle. I have read up what I could on it and most people recommend a new ride plate but I would like to hear from someone who has actually fixed the problem on an SS. Is there anything you can mod on it without buying a $150 part? Can you alter the stock plate buy adding on or something? Also, has anyone heard of Rend Top Speed Ride Plates? I understand the company is no longer in business but found a source for their plates.

Thanks