For live performance... less is MORE.
The more connections, the more things to go wrong. K.I.S.S.
You have plenty of percussion modules... then you'll need to mix them with a submixer or all your main mixers channels will be clogged up with them.
For percussion, I would go with a sample playback module that allows for muting of individual tracks within the module. Unless you're focused on bending percussion samples, I would just simplify things by using sample playback. You can always record your own percussion before your live set.
Modules like Braids and Plaits are also popular in live set-ups because they offer a wide range of sounds that can be accessed and tweaked very quickly.
Also, an output module might be tasty... especially one with a pair of built in isolation transformers. You DO NOT want someone messing up and sending gear melting voltage back down your rig's audio path and frying your modules.