^WHS
It's also necessary to keep the revs up a bit by not coming completely off the throttle 1st - 2nd. Almost like rev-matching a downshift--the revs drop quickly and that leads to that "I'm driving my first MT" experience.
Ditching the CDV also helps--but even w/o it if you don't keep the revs up a bit you'll not be smooth.
Here's a
thread on the transmission mounts. I highly recommend the RE neoprene for street use.
The "clunk" is normal BTW. I've been in a lot of Z4Ms and they all do this.