Actually, having a pair of the same or similar VCOs makes perfect sense. If you're using the Dixie II+ as a 'primary' VCO, then the II is an excellent choice as a doubling VCO, since the waveform purity and control behavior should be extremely similar. The Rene choice is also just fine, given that you've paired it with the Tempi; the two of those together are a very potent combo due to some shared functions between the pair. About the only change I'd consider here would be to remove the LxD and the Intellijel Unity Mixer (the TriATT next to it is sufficient), and swap in a pair of Erica Pico LPGs which then give you internal decay envelopes on 'ping' plus some resonance adjustments for better LPG control.