Love the rack, you pu some thought in it!
Get a few LFOs and some more envelope. Math would serve you well or the quad envelope by intellijel. You might wanna get their quad VCA too sincethe have it in 1u. You got the sealegs, so I do not know why you need the springray. Maybe a choice of taste? If you want more flexibility on effects get an FX aid, can't do nothing wrong there. Some random sources, DivKid RND (and OCHD LFO) might be neat. If you want to be flexible on CV because you do not know where the journey takes you consider Pamelas new workout or Octocontroller. Where do you mix your signals?
That is my humble opinion anyways :)