Hello Again
I have now been using a Rpi3 (recognized as a Rpi2) for a while, and I think I owe you (Frank) a short update.
I CAN hear a difference when using the different kernel optimizations. It is not a HUGE difference, but clearly noticeable.
The setting OrionV2 is the most "damped" one with great transparency in the midrange. The 2 OrionV3's has more "sparkle", but has not the full transparency as the V2..
If you ever need someone to listen/test some future changes in the optimizations, then I will be more than happy to try it for you!

Kind regards,
Rune Frost