I have fitted several BT headsets and most,benefit from moving the earphone closer to the ear, some mount a distance away from your ear 'ole.Try playing music etc through the BT while adjusting the position of the earphone to your ear, until you find the sweet spot. Some digging of the liner may be required, and packing the earphone so it fits closer to the ear was a great help on one of my helmets. Adhesive Backed Velcro works well to pack out the earpiece.