Oh, dealing with sound issues can definitely be a bit of a hassle, especially during live performances! I've had some experience with Bose systems and they generally deliver great sound, but every setup has its quirks.
For the feedback and clarity issues you're experiencing as you raise the volume, it sounds like positioning might be playing a big part. Make sure your speakers are placed away from any walls or corners as these can amplify the bass frequencies unnaturally and cause muddy sound quality. It’s also crucial that the speakers face towards the audience and away from microphones to minimize potential feedback.
Regarding stands or mounts, Bose typically designs their gear to be compatible with standard mounting equipment, but they do offer branded stands which are optimized for their products. These might come at a premium but can often ensure better stability and acoustic performance tailored for Bose systems' unique output characteristics.
For cable management, I always recommend using velcro ties and ensuring cables are neatly routed behind stands or under carpets where possible. This doesn't just make your setup look cleaner but also reduces tripping hazards and minimizes interference from electrical cables running parallel to audio lines.
Lastly, don’t forget to play around with the EQ settings on your mixer or speaker system; sometimes tweaking a few frequencies here and there can significantly improve clarity. And if your budget allows, consider investing in a splendid quality direct box or an audio interface which could give you more control over sound output.
Hope this helps you get the best out of your new Bose system! Rock on!