The vibration issue is definitely there. It doesn't happen every visit, but when it happens, you'll notice it. This tweet from a GP is evident of that.
If you look up some POVs from different times last year, you can even hear it. You can also see how much it slows down towards the end:
Compare that with Robb's videos from media day.
We rode is this season and last year during fright fest at the height of the "vibrating" and noticed no difference and thought it was awesome both times.
If it was during Fright Fest, no wonder you had a good ride. It started running good again then. It seems to run better in cooler weather.