Can you elaborate, Fran?
You say to work on where he is striking the cue ball, but not to mess with his timing. I always thought the two were very closely related?
I'm not speaking for Fran, but in my experience,the two are related, but take place at different times. Determination of tip placement takes place during warm up strokes. That is the reason we do them. When the warm ups are complete, that is when you are ready for the final stroke and delivery of the tip to the cue ball. The timing/rhythm of the stroke needs to remain consistent.
Steve