I have a 78 cb550k and weigh 220lbs my wife who will also be riding the bike is 120lbs. I have done the spring rate estimator for both my wife and I and they come up with 87lbs for the spring (which I am not totally understanding what that means). What I am looking for is a set of rear shocks that will not break the bank, change the handling where it is unsafe (I.e. too long) and that will be a soft ride for my wife and I. Thanks