I'd lose the Akemie's Taiko personally; you've already got four of the base drum elements (kick, snare, hi-hat, and clap), what you could use instead of the Taiko if you were going to add something is something fun like claves, marakas, or (dare I even suggest) more cowbell.
I'd replace it with a matrix mixer. Matrix mixers are great because you don't have to repatch to send a modulation source to some input; with that joystick, I think you'd find you like being able to send it to something like a filter cutoff, then reroute to send it to something on one of your primary voices. The other thing matrix mixers are really good at is combining modulation. Take an LFO, add an envelope (triggered from your drum sequencer), and you've got a really interesting waveform that's particularly playable. If you're thinking you'd like to instead keep more than four drum elements, instead of a matrix mixer I'd suggest a sampler. Some sampler would likely be more useful than the Taiko, maybe Squarp Instrument's Rample or Erica Synth's Drum Sample. You could even net a vocal sample or two this way, which is fun.
Also, having a filter for every voice is proving to be so very very tasty. Filtering down a voice is the simplest way I've found to keep that voice interesting while simultaneously giving your audience's ears a temporary break. Might consider adding a tiny filter like WMD's C4RBN for your drums, but you do already have the Morgasmatron so dunno.