Dear Robert: I don't have experience with your tonearm but I have experience with the Koetsu Platinum series ( in my own system and in other great systems, with pivoted and linear tracking tonearms: all first rate ones. ).
I never heard ( anywhere ) a better sound from the Onyx Platinum that when was mated with the Ikeda tonearm and very close to this in the Dynavector with a medium weight headshell in my own system ( and this experience was not because my system is better than other ones, no it is not: it was because that cartridge mated in great way with those tonearms and not so well in other ones. ). I already heard your Jade in two different systems one with a pivoted tonearm and the other with a linear tracking, in both times the sound was very good but nothing close to what I heard to a very similar cartridge in the other two tonearms. A friend of mine ( Dan, an Agonner. ) that own the Jade with the Ikeda tonearm report/inform/speak to me that this combination is marvelous and he is extremely happy with that.
IMHO, this simple tonearm change could make a bigger difference in the quality sound reproduction that the TT change.
Now, I don't know for sure if the Walker could work with the Ikeda tonearm but yours, Brinckman and Kuzma can do it.
Regards and enjoy the music.
Raul.
