It took me a bit to think it through. Think of this. Use manual CTE. Line up a 30 degree perception (B) inside. You know the first step, moving cue straight in on the left or right side of CCB by 1/2 tip. Once you are there with head directly down the cue shaft, shift your eyes over top of CCB from there. The CTEL perception should be on the edge of the OB. If its not perfect, tweak it by rotating around the CB slightly (keeping your head directed down the cue.) Then proceed to pivot to CCB and shoot. You will be looking at an angled cue at this point, which is correct. Trust it and shoot it, straight stroke. 15 degree perceptions work the same, except the CTEL is one tick outside of the OB quarter. Watch that first video a couple times.