I dont remember there being a terrific rivalry between Caley and County in the old days and doubt that jags had a great one either.However it must have become more intense when Bobby Wilson took over as manager and won the HL twice I think! Elgin were number 1 enemy with Huntly Keith and peterhead winning things but at different times (70s and 80s). My number one memory of Dingwall is probably not much good to your project but County had a small wooden stand and one midweek match my friend and I were sitting beside the tunnel. Roddie Davidson took a head knock and had to come off due to blood pouring down his face. My friend who was blood phobic took one look at him and fainted needing medical attention herself.
I remember being really surprised when they won election to the sfl everyone thought it would be ourselves and Gala Fairydean but as now it was seen as great news that 2 highland teams had done well.