I think I drafted it like this precisely because only one direction of the interchange is a direct connection, and the other makes use of that short stretch of 1373. What do you think about a single point for 80, 1373, and 3174 there?
Another alternative would be to leave 80 as-is, and add the point for the ramps to 3174 from 1373 as you suggested, but I don't know that adding that point while making a separate graph connection for 80/3174 would be consistent.