Carts on JMW 9 Signature

I have tried a Grado Sonata and Shelter 501 on my 9 sig, while 95% of the time they both sounded incredible, I could never get rid of IGD and mistracking at high amplitude/frequency peaks. I used a Mint and OCD'ed on alignment and tracking force to no avail. So, VPI agrees that these carts are not compatible with the 9" arms due to less mass, but are fine with the 10" arms. I would just like to find something that "works".

The Shelter and Lyra work better on the 10" arms, mainly because of the increased mass of the arm. I have considered the 20x, but I was looking for something a step above it. Thank you.

Jmcgrogan-I have been considering the Blackbird, can you compare it to any other carts? It seems to have fallen out of favor (not many people talking about it lately), what do you think?

I sincerely appreciate your input, I simply want to find something that "works". Thank you.

I have already had some bad luck, thank you for the input.

Thank you, I now have something to think about.