Nope, I was mounting an AT440MLa at 6.5g, and it's too light to balance without added weight. This table comes with a pivoting (!) metal cartridge insert for the headshell in which is mounted a cartridge with no mounting tabs (it's not a p-mount, just has no mounting screw holes). You can see it in my Kenwood KP-4021 thread here:viewtopic.php?f=18&t=28325&p=358180#p358180
(can't figure out how to link to a specific post, but it's near the bottom).
I was able to get the AT reasonably well mounted, though it's impossible to align perfectly b/c when it is aligned at one null point, the other is off no matter how far forward or back, nor how straight or twisted I get it in the headshell. I think it's a Baerwald protractor, but not sure. This is a different issue, but despite less than perfect alignment, it sounds pretty darn good.
So I'm still interested in the sound of compliance mis-matches. By adding the pennies, I'm thinking I've made mess of something, and compliance mis-match seems like the obvious bugaboo. How would I know if I had such a mismatch?