Well, my thread referenced above was deleted for some reason. Asked Agon staff why, no reply. So I'm going to post here since this seems to be an open forum for the SL-12x0. I've installed an AT440MLa and it is much better, IMO. It is more lively and upbeat with better PRaT. The highs are also much more extended. The build quality and overall design of the Shure is very nice at it's pricepoint, the AT is cheap looking in comparison, IMO. But it's the sound that matters. One thing that really irritates me about the AT is they didn't even scribe a line in the top of it to line up the needle for easier queing. Blackmongoose, I did experiment with the brush, tracking force, and VTA on the Shure, nothing seemed to help.
I've been playing around with the VTA on the AT, and I discovered a problem with my brand new TT. I could barely raise the VTA above 4mm, even with two hands and four fingers. WTF? Agon member Cytocycle suggested that perhaps the tonearm cables were too tight. Called Kevin at KAB and got his blessing to flip table, remove base and cable clamp for tonearm cables. Sure enough, the cable's were clamped in the wrong position, not enough slack, causing the VTA adjustment to bind. I repositioned clamp and can now freely move VTA from 1-6mm.
Anyway, I like the AT much better than the Shure (for sale) for shure (hehe), but it still isn't on par with digital in this system. And it's not even in the same league with the Naim setup in my main rig. I prolly really need to do a phono pre. I may try to pick up a used Gram amp 2 here on Agon. I just don't want to sink too much money into this rig.