Namaste and welcome to day 15!
As you keep honing your chanting, is it possible that listening to your voice and noticing the quality of your breath may be keeping your mind focused more easily? Still, if distractions emerge, you keep coming back without strain, without struggle, with no judgment and with a gentle smile.
In case you’d like to release tension from your shoulders before meditating, you may try:
Seed sounds (bija): Lam, Vam, Ram, Yam, Ham and Ksham.
Guided meditation below, when the recording comes to an end, take as long as you wish to enjoy the silence and to savor the effects of the practice.