I think you need to step back and really think about what kind of
sound you're trying to create with your synth. What you seem to lack
may be physical (not the right module) and it may also be mental (your
understanding of how to create X sound).

First thing I noticed is that you don't have a VC ADSR. However, you
can get similar effects by combining two ADSRs into the same input.
You can get really snappy envelopes that way. You can also get a
snappy sound by sending one envelope to modulate the pitch of an osc
and the other to modulate the filter. Another thing about ADSRs is
that you should make use of the sustain and release to create nice
envelope shapes.

I think if your $2000 synth doesn't sound like $2000 it could be your
quality of filters. I would love to hear the A-102 and A-124. I know
the Polivoks it good... well that's what everyone says.

Second thing is that you should understand how to make your synth
scream. Bandpass and notch is where it's at! I used to think lowpass
filters make synths scream. I was wrong! Create feedback patches by
multiplying a filter's output to go into itself with a saw wave and
out to your speaker, use notch or bandpass. Now invert the signal
going back into the filter... it's really confusing IMO. But it
doesn't look like any of your modules can invert a signal.

Here's how the Model 12 sounds with inverted feedback:
http://www.elanhickler.com/misc/model_12_scream2.mp3

Another thing is that you don't have any real way to create the
classic screamy sync sound. Actually, you can use an envelope. Patch
it into the pitch control instead of patching your CV1 from your midi
module. Turn release, decay, and attack to 0. Use the sustain knob to
manually modulate the pitch.

Lastly, a few modules have already been suggested; the A-137 and A-
188. Those modules are good to have, yes, but I don't think they move
your synth in the immediate direction you want to go, and that is fat
and hard sounds. What I suggest is an oakley overdrive to help your
filters scream: http://www.oakleysound.co.uk/overdrv.htm You need to
ask the oakley guy if he can make you a eurorack overdrive. It may
take a little more than a month for you to get it. I ordered my own
just yesterday.

I would suggest a saw animator to create supersaw sounds, but it looks
like there's none available. E-mail Cynthia about it: http://www.cyndustries.com/modules_sawtooth.cfm