It sounds like you're experiencing some frustration with tuning stability, especially with non-locking trem systems. Suhr guitars are definitely high-quality instruments, but your concerns are valid given your past experiences. Here are a few points to consider:
- Set-Up and Maintenance: Proper setup is crucial. Make sure the guitar is set up by a professional who understands your playing style and the specific demands you place on the tremolo system. Sometimes, minor adjustments in the setup can make a significant difference.
- Nut and Bridge: Ensure that the nut is properly cut and lubricated, and the bridge is functioning smoothly. Binding at the nut is a common issue that can affect tuning stability.
- Tuning Stability Techniques: There are techniques that can help with tuning stability. For instance, after using the tremolo, you can do a gentle pull-up to help the strings return to pitch.
- String Trees and Retainers: Adding or adjusting string trees or retainers can help improve the angle and tension of the strings, which can contribute to better tuning stability.
- Quality of Components: High-quality components, like those used in Suhr guitars, do generally contribute to better tuning stability.
- Consider Locking Systems: If tuning stability with a non-locking tremolo continues to be a significant issue, you might want to reconsider a guitar with a locking tremolo system, even if it's not your first choice aesthetically or in terms of feel.
From my experience, brands like PRS (Paul Reed Smith) and some high-end Ibanez models are known for having non-locking tremolo systems that can hold tuning well with proper setup and care.
Ultimately, it might also be worth consulting directly with a luthier who has specific experience with high-end guitars and tremolo systems to get personalized advice and setup recommendations.
Hope this helps, and best of luck finding the perfect guitar!
Cheers!