In the research finding in the following link, authors reported that cuttings from the upper part of the stock plant produce less roots and have a higher percentage of axillary bud break than cuttings from the more basal part of the vine. This may give you more ideas.

https://www.ishs.org/ishs-article/226_17

Have you used MS or DKW medium with BA 1 mg/l?

Thank you

Dear Kourosh Vahdati ,I use MS medium with Ms Vitamins