35 sounds as good as any. If your jetting is good the timing will not be a big issue. The new BT-H can vary as much as 9 derees ( at least mine does) with the rod in place when setting the timing. If the rod is slipped in the center of the armature (and threaded hole), you with be able to move the crank 4.5 degrees on either side of TDC as everything takes up the clearances. Because I was trying to do repeatable runs I needed to know more exactly where the spark was firing. I checked the timing with a strobe and found that after you slip the rod through the armature you need to move the wheel in the direction of travel to take up all the slack on the rod. On mine, this is where the spark was firing, i.e. not the 4.5 degrees earlier when the rod can slip in or out with ease. I do not think these numbers matter to you, but I mention them to urge you to pick a way of setting the timing that will be repeatable by you with ease. Then you will at least be consistent.
David