In my view the upgrade to Kuzma R or Ref II with 4point should be significant.
The 4point is pretty much unbeatable in my view for the money. I have installed 4points vs other arms such as Moerch, Helius and a few others - it is a step up in transparency and very neutral.
The overall sound of the Kuzmas/4point I would describe as self effacing - neither lean nor bloated - nicely balanced. One thing I really like is that the Kuzmas designed to be easy to set up which makes dialling them in easy.
For phono stage I would suggest investigating the cost of adding the Gryphon Legato Legacy phono boards to your existing Pandora. The Pandora is state of the art so why not take advantage of that architecture ( dual mono power supplies etc ) and just get the phono boards installed. ( You also save the cost of interconnects phono to pre ).
Cheers.