Just out of curiosity, why did you choose 1985? What's so significant about that date? Why not the volatile period of late 50s early 60s. That would be a better comparison in my opinion. Nothing really major happened in that year.
Reagan and Gorbachev met for the first time that year to end the Cold War. That was a pretty significant event.
Horse sense is the thing a horse has which keeps it from betting on people. ~W.C. Fields
Again I am referencing what was believed at the time. The US right was frothing that the US was losing the arms race and I and the US had every reason to do so. I tried numerous times to document USSR infiltration of the North American "peace" movement that was largely a front for anti-American propaganda.
In my recollection no one was saying anything much Soviet decline until much later when we were looking at the fall of the Berlin Wall which caught the CIA completely by surprise.
As a frothing right winger at that time I can certainly agree that there was concern about the USSR nuclear capabilities. One of the biggest concerns, in fact, was that if their economy collapsed or they experienced massive civil unrest that the nukes would start flying. That's why we wanted the missile defense shield or "star wars" as it was more colloquially known. In fact, in 1985 I was stationed in Colorado Springs which, as I'm sure you know, was home to NORAD. We had no illusions about whether or not we were on a Soviet target list so as far as I was concerned the more space lasers we had the better!