psc 31 pointing
I have an 88 PSC 31 too and it points very well. I have older sails and the scheel keel which most say does not point as high as a standard keel. I think you are right to start with the rig tune.
I highly suggest the Brion Toss web site to learn to do the tune yourself even if you are most comfortable with watching the expert do the first one.
John Van Dinther