I know what you mean by consolidating powders vs calibers.. I do the same thing.

I've adjusted QL to the info you've provided and 51.5 is right on the node using optimal barrel time (OBT). I would shoot 3 shots of the following charges and re-evaluate.. (put the stickers on one piece of cardboard and shoot round robin so we can evaluate POI for each charge)

50.6
50.9
51.2
51.5
51.8
52.1
52.4

Those VLD groups look more promising than the 123 Amax.. I've had good luck with the 142 SMK's in my 260 Rem... They shoot the same as the 140 Berger Hybrids and cost just a few dollars less. Good luck with it.. Again, this is just my opinion on where I would go from there... It may be dead wrong but I think you will find something in that range...