Everyone will recognise the simple Dinkler-Thor differential axis vectoring setup here. The problem is that I can't rotate past 27 degrees without the inverter fluctuating and losing lock. Can anyone spot my mistake? I feel like I'm missing something really easy.
The whiteboard in the background shows an inverter configured for passive resonant signal filtering, but it looks like you have the inverter wired through a pre-amp matrix, which would default to active filtering. This will certainly cause instabilities beyond 27 degrees or so.