Acid Rain Maestro could be cool, for rhytmic modulation, but its expensive
I enjoy "clank chaos" as a brain for a little system. But it can be very "chaotic" and you need to tame it :D

I would not remove the pams
It has so much to offer.
If you need logic - pams also has great logic operations in it.
It has lfos, random and much more

Your system looks to me to become a bit drum focused.
With pams you can do insane rhytmic stuff trigging and controlling the sampledrum and plaits.
If you use the logic, its totally awesome.

You could add utillities to combine with the pams and it blooms more.

On its own the Rack seems very uncomplete to me.
look for some basic modules like:
vcas, a filter, cv utillities, matrix mixer, function generators, lfos

you may could add a nice standard vco

Greetings

Chris