I see you're using a lot of Erica TUBE/Fusion modules as well as the Plasma Drive. What is your power supply situation?

To add some interest... a Trigger Riot, for complex pattern generation might be fun for your drum situation.
A Worng Electronics Vector Space for complex modulation possibilities.
A Noise Engineering Mimetic Digitalis for adding some stepped CV modulation into the equation (lots of fun hooked up to the Trigger Riot).