Pixel 7 is great but two other phones have constant micro-stutters

Hi, my Google Pixel 7 works very well. But my Pixel 2 and my Galaxy A40 phones have near-constant micro stutters. Even with all else being equal. Same Wi-Fi antenna. Same source material. All fresh installs of AudioRelay. All I want is to listen to sports games streaming off my Nvidia Shield. I need as little latency as possible. So, my priority is low-latency. Audio quality is second but I don’t want it sounding terrible. If I can get this working on my Pixel 2, I’ll end up buying the software.