not sure which is more off.. "Dunlap" (sic) or that they are the cause of cupping...
If cupping is your issue,
some cupping is normal on a lot of front tires as they reach the end of their service life..
other cupping is not normal and is a good sign that the front suspension is just toast.. not much adjusting to be done till the oil and valving are freshened up... this is something that is not easy for a rookie to determine.. If the front end is soggy? probably time for some work.. You really need someone familiar with suspension to take a look at the bike IMHO..
Pics might help but if the tires are about worn out, I wouldnt bother..