Thorens 160MKII BC Grace 707 + F9????

Yes, the world is full of wonderful vintage Japanese tonearms, and I am not being facetious.

Chridabs, why not relax, take a breath, and evaluate what you now own over a period of several weeks? These other items will always be out there to buy if you get the itch. I guess I already said all that. If you can get the headshell to sit so it’s parallel to the LP surface, that’s fine enough for azimuth. 

If you look up the compliance data for the F9E vs the F9Ruby, I really do not think you would find much if any difference in compliance. Your finding that the Ruby was bright and hard in your system does not at all gibe with my experience in my system, but that just goes to show the importance of ancillary equipment in determining one’s impression of any cartridge. In fact, one of the things I like better about the SoundSmith OCL stylus vs the stock Ruby stylus is the fact that the former does have a better more extended top end and with greater transparency. (I own two Grace Ruby cartridges, one still with its original stylus and the other with the SS max upgrade, so I have been able to compare them straight across.)

I dunno if the 707 is amazing, but I do know it will work fine with the Grace cartridge of the same era.  Why not give the Thorens/Grace tonearm/Grace cartridge combo a listen for a few weeks. If you are dissatisfied at that point, you can then make some changes. I personally believe that an F9 with any one of the better Soundsmith replacement stylus assemblies will give any sub $1000 MC cartridge a run for the money. Give it time to break in.  I own an F9Ruby with the SS sapphire cantilever/OCL stylus; it's excellent.

The OP won't spend to repair the Luxman. Why would he spend several hundred more dollars to replace the perfectly good tonearm he received with his replacement turntable? And for the Grace F9, it is not at all clear that the Acos would be significantly superior to the Grace 707. But I guess that is all up to him.

What would make you think that a Grace tonearm marketed contemporaneously with a Grace cartridge would not be a good match?