Ed, I'm having trouble with those pieces (referring to SORs Lesson 8, 2nd boxed area; and Lesson 9, first boxed area), it took me a while to hit the C# and G notes at first. Note, its not a shift. For Lesson 9, after hitting the open "D" then C# notes, I move my index finger to the "C" note position, while hitting the F# and D notes (this may be considered a shift, I don't know). I then lift my "ring finger" and my index finger is already in position to hit the C note which follows.
Hope it makes sense. I may be telling you something you already know/do. Let me know, and I'll make a video and post tonight when get home from work if you need to see this. If you are doing this now, then I guess you need to keep at it: 1) hit the notes in sequence without regard to tempo, then 2) start working very slowly and increase tempo over time (long time..).
1989 Takamine C132S, Aquila 19C strings