You think it’s from the power or is it something else?
I'm not sure but I dont think it's just the power. It's likely cumlative between different sources. I think the OPA2134 chips were used to provide noise reduction in that regard.
What I do know is... the production unit I have is a v4.0, and the board I recently got from the VFE site is also v4.0. Peter's old DIY instructions say "Rocket EQ - built exactly as shown on board". However the assembly sheet is for the v4.1 which, as far as I can tell, have lower resistor values and higher cap values in the RC filters. The v4.1 was the one in the download bundle as well. I assume the changes from 4.0 to 4.1 were mainly to help lower the noise by lowering the resistor vaules. The schematic from the eagle files is a bit tangled so it's hard to make out what exactly is going on circuit wise. The block diagram from the old vfe site helps though.
Im really just using this as a learning opportunity.