You should be able to use one of the four channels of Veils as a "stand-alone" attenuator (when you plug into one of its outs, it breaks the normalization to the channel below), and Maths can also do this, so I think you are pretty well covered with attenuators.
My recommendation for an offset plus attenuverter would be Happy Nerding 3xMIA, which is awesome. But again, I think you are pretty well covered in this regard, and that wouldn't be my next step.
For modulation, I would go with Zadar rather than Batumi. Zadar is great as an envelope generator and for general modulation (but admittedly, I have never used Batumi).
But how are you generating frequencies and gates for the VCO? How about a sequencer, quantizer, or a signal & hold for that? Or a Midi to CV converter if you like to play a keyboard into it? Or Marbles, that would also take you some way in this direction.