Unless you have your X very heavily loaded it should do better then 80 mph. I am about 230 lbs in full gear and carry about 15 lbs in a top box. I had problems with top speed on my 2016. Had trouble keeping it at 70 mph on the interstate if there was much head wind and could not really over take in any real sense. I was seriously considering getting a different bike with more power. Then I did a valve job on it at about 4500 miles. All valves were tight, one exhaust valve was VERY tight. After correcting the valves it is a very different bike. At 80 mph it still has plenty of power to over take and pass. On a late night run on a deserted rural stretch of interstate I was able to confirm it can now do triple digits fairly easily. Its at 9300 miles now and doing quite well.
Not to be too much of a stickler but a valve job and a valve adjustment are vastly different things. You probably know that. Valve job is what do if you wait too long without doing a valve adjustment.