Those are all good riding tips and apply to any challenging ride. My recommendation a bit more basic and that is to hang back from the other riders and watch how they negotiate the turns.
I rode the Sisters by myself the first time, and too aggressively, ending up in a pasture when I discovered a cattle guard across the road in near switchback right turn. I was leaning pretty far over and at a good clip, which was just fine for a turn with no hazards, but not for one with a cattle guard. I knew if I hit the guard at my speed and lean angle, I was going down. I slowed my speed with the front brake, which stood me up as expected, and went off the road into the pasture after passing safely over the cattle guard. I was fortunate that there was no barbed wire fence and no ditch.
I had broken one of my basic ride rules which is to scope out a challenging course, whenever possible, before taking it at fun speed. If that is not possible, I always do what I recommended above, stay in the back with a group of riders and watch them in the turns. And of course, ride your own ride at your own pace as others have suggested.
The Sisters is a blast. And one more, the desk clerk at Frio Farms, which was I believe one of the owners, told us how many sport bike riders they have to medivac every week during the season. Stay safe and I wish I could be going with you.