The "midbass ripeness" is a typical characteristic of the Linn table.
Aside from the stand, which you have addressed, there is not too much that can be done without dis-assembly or the table or arm. Even re-doing the adjustment of the suspension requires some dis-assembly.
Given these guidelines, I would recommend that you get an Expressimo Audio Heavyweight drop counterweight for the RB300. This is as easy to install as your stock one. Makes a nice improvement in sound. Under $100.
If your phono section can accept it, a good MC cartridge might be a nice improvement. Like a Shelter 501. $800.
If your phono section needs improvement, that can really make the analog setup sound better. Take a look at some nice tube phono sections, that can accept low output MC carts, or a good tube MM phono section and a good Step-up Transformer. EAR and ARC make some nice ones. The Wright phono stage is real good. Probably about $1k+ for a nice one. Or consider a used tube preamp with a MC phono stage, like the MFA Magus, or Audible Illusions, or Counterpoint, or ARC SP-6. May need re-capping.
If you want to do some dis-assembly on your Linn, then you could think about some other things.
Aside from the stand, which you have addressed, there is not too much that can be done without dis-assembly or the table or arm. Even re-doing the adjustment of the suspension requires some dis-assembly.
Given these guidelines, I would recommend that you get an Expressimo Audio Heavyweight drop counterweight for the RB300. This is as easy to install as your stock one. Makes a nice improvement in sound. Under $100.
If your phono section can accept it, a good MC cartridge might be a nice improvement. Like a Shelter 501. $800.
If your phono section needs improvement, that can really make the analog setup sound better. Take a look at some nice tube phono sections, that can accept low output MC carts, or a good tube MM phono section and a good Step-up Transformer. EAR and ARC make some nice ones. The Wright phono stage is real good. Probably about $1k+ for a nice one. Or consider a used tube preamp with a MC phono stage, like the MFA Magus, or Audible Illusions, or Counterpoint, or ARC SP-6. May need re-capping.
If you want to do some dis-assembly on your Linn, then you could think about some other things.