Questions on suspension parts

[infernosg]

Well, I got everything installed this past weekend. Aside from breaking the speedometer drive gear in the transmission (so currently no speedometer) everything went okay.

I'm disappointed how much drivetrain lashing I still get; even with the full set of Mazda Comp. engine, transmission and differential mounts and delrin subframe mounts. The only thing with the stock rubber back there is the vertical stabilizer bar. What I call "lashing" is the jerking/bouncing and noise associate with on/off/on throttle transitions. Because I lack the proper tools, I had a shop set the backlash and ring gear contact so I don't know why there is more noise going on unless they didn't do it correctly. I also did not install a pinion snubber as I didn't think it would be needed, but I'm guessing that was a mistake.

Is there something else going on here or is this just a fact of life with a FC?